Elekta Medical Linear Accelerator [PDF]

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User Manual

Elekta Medical Linear Accelerator Clinical Technical Reference Manual for: Elekta Synergy® Platform, Elekta Synergy®, Elekta Infinity, Versa HD™, Elekta Harmony, Elekta Harmony Pro

Document ID: 1531930_05 Publication date: 2021-01 Language: English

Copyright statement Copyright ©2021 Elekta Limited. All rights reserved. Do not copy or use this document, or parts of it, without written agreement from Elekta Limited. All trademarks and registered trademarks of Elekta products are the property of the Elekta Group. Acknowledgment of other trademarks Elekta acknowledges the trademarks and registered trademarks of other manufacturers that we use in this document. Referenced documents Elekta does not supply all the documents that we refer to in this document with the equipment. Elekta reserves the right to make the decision on which of the documents we supply with the equipment. Elekta Solutions AB Kungstensgatan 18 Box 7593 SE-103 93 Stockholm Sweden Tel: +46 8 587 254 00, Fax: +46 8 587 255 00 Worldwide product manufacturing centers - Oncology Elekta Limited Linac House, Fleming Way, Crawley, West Sussex. RH10 9RR. United Kingdom Tel: +44 (0)1293 544422, Fax: +44 (0)1293 654321 Elekta Beijing Medical Systems Co., Ltd. No. 21, Chuang Xin Road, Science and Technology Park, Changping District, Beijing. 102200 P.R. China Tel: +86 10 8012 5400, Fax: +86 10 8012 5401 For technical help, contact your local Elekta representative or Elekta product support - www.elekta.com/services

Document ID: 1531930_05

Elekta Medical Linear Accelerator Clinical Technical Reference Manual

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Table of Contents

Table of Contents Chapter

Title

Page

1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2

Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3

System description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4

Technical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

5

Technical data for the treatment table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

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Table of Contents

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Introduction

1

Introduction

Section

Title

Page

1.1

Document scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7

1.2

Conventions used in Elekta documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

1.2.1

Device conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

1.2.2

Intended users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

1.2.3

Typographical conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

1.3

Glossary of terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

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Introduction

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Introduction Document scope

1.1

Document scope This document contains the technical reference information for the clinical user, on the Elekta Medical Linear Accelerator. The Elekta Medical Linear Accelerator has three levels of functionality: Entry, Mid and High. The following table shows the functionality level associated with each model. Table 1.1

Levels of functionality

Stereotactic radiosurgery (SRS) immobilization

Level

BLD

Volumetric Imaging (XVI)

Elekta Synergy*

Entry

MLCi2 or Agility

No

No

Elekta Infinity

Mid

MLCi2 or Agility

Yes

No

Versa HD™

High

Agility only

Yes

Yes

Elekta Harmony

Entry

Agility only

Option

No

Elekta Harmony Pro

Mid

Agility only

Yes

No

Model

*This includes older EMLA model configurations marketed under the name of Elekta Synergy Platform. The treatment control system software used is Integrity Release 4.0, version 4.0.6 This document contains clinical information relating to the Elekta Medical Linear Accelerator including the treatment table. However it does not contain information relating to MV or kV imaging or the various available table tops. This document contains information on different modes of operation, X-rays and electrons energies, and radiation parameters. All these functions may not be applicable to all models of the Elekta Medical Linear Accelerator.

Elekta Medical Linear Accelerator

Document ID: 1531930_05

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Introduction Conventions used in Elekta documentation

1.2

Conventions used in Elekta documentation

1.2.1

Device conventions 1

3

2

5 6 4 7

0280_LMLA

Figure 1.1

Note:

1.2.2

Conventions for the directions of the linear accelerator

(1)

Treatment room ceiling (top)

(2)

Linear accelerator gun (G-end)

(3)

Linear accelerator A-side

(4)

Machine isocenter

(5)

Linear accelerator B-side

(6)

Linear accelerator target (T-end)

(7)

Treatment room floor (bottom)

The A and B positions in the figure are correct with the gantry at 0° only. The A and B positions rotate with the gantry. Therefore, with the gantry rotated 180°, A and B are opposite.

Intended users Table 1.2

Term Authorized person

Document ID: 1531930_05

Definition of persons who can use or work on the equipment

Definition A person that is permitted by the user to use or do work on the equipment by the User of the equipment.

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© Elekta Group 2021. All rights reserved.

Introduction Conventions used in Elekta documentation

Term

Definition Note: The authorized person must have the correct level of knowledge and training before using or doing work on the equipment.

A person that is approved by Elekta to have the necessary knowledge and Elekta approved training to do specified tasks on Elekta equipment. person Note: The authorized person must have the correct level of knowledge and training before using or doing work on the equipment. Operator

A person who operates the equipment with or without help from an assistant, and who controls some or all the functions of the equipment. Note: The operator must have the correct level of knowledge and training before using or doing work on the equipment.

Clinical User

A person who operates the equipment for the treatment of patients. Note: A Clinical User must be a qualified person who has the necessary knowledge and training in the safe, clinical operation of the equipment. Such treatment must be therapeutic only.

Clinical User – Radiation Therapist

The role of Radiation Therapists, also referred to as Radiotherapists, Radiation Treatment Technicians or Therapeutic/Therapy radiographers, may be different based on their geographical region and experience/qualifications. However, their primary roles and obligations are expected to be similar among different regions and sites. Note: Radiation Therapists are trained on all aspects of system operation, but not trained on installation, calibration or service maintenance. Note: Radiation Therapists who work at the site when the system is installed will be trained by an Elekta trainer. After the system is introduced, Elekta authorized trainers, or experienced Radiation Therapists who are already trained on the equipment, can train Radiation Therapists who are new to the equipment.

Clinical User – Medical Dosimetrist

Dosimetrists design, generate, and measure radiation dose distributions and dose calculations in collaboration with the Medical Physics Expert and Radiation Oncologist. Note: Dosimetrists are trained on the general principles of system operation, but not trained on installation, calibration, or service maintenance.

Medical Physics Expert (MPE) Radiation Protection Advisor (RPA)

A person that is recognized by a competent authority to have the necessary knowledge and training in radiation physics, or radiation treatment, to give information on patient dosimetry, use of radiation procedures and equipment, on optimization, quality assurance, do the applicable tests and calculations for radiation levels and dose assessments, and other items related to medical radiation exposure and safety. Note: Medical Physicists are trained on performing system QA procedures and calibration or service maintenance tasks.

Radiation Oncologist

A physician whose trained medical specialty is the use of radiation therapy as a treatment for cancer.

Radiotherapy Nurse

A Nurse with specific focus on the Radiation Oncology clinic patient support. Certain countries utilize specially trained nurses to run the Linear Accelerator.

Qualified person A person that is recognized by a competent authority to have the necessary knowledge and training to do specified tasks. Note: The qualified person must have the correct level of knowledge and training before using or doing work on the equipment. Qualified Expert A person that is recognized by a competent authority to do the applicable (QE) tests and calculations for radiation levels and dose assessments. The person Elekta Medical Linear Accelerator

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Introduction Glossary of terms

Term

Definition also provides information on the necessary correct radiation protection and procedures. Note: The qualified expert must have the correct level of knowledge and training before using or doing work on the equipment.

Service User A Service User operates the equipment to do maintenance tasks. A Service Service engineer User is a qualified person who has the necessary knowledge and training to set different software configurations, do the necessary tests, adjustments, optimization, and calibration procedures on the equipment. Such operation must not be therapeutic. Note: The Service User must have the correct level of knowledge and training before using or doing work on the equipment. User

The organization or person responsible for the operation and maintenance of the equipment. Note: The user must have the correct level of knowledge and training before using or doing work on the equipment.

For more information on persons that can work on the equipment, and on training, contact your local Elekta representative.

1.2.3

Typographical conventions Table 1.3

Conventions for text formats in Elekta documentation

Text format

1.3

Definition

Bold text

Text used in the graphical user interface.

UPPERCASE LETTERS

Keyboard keys and keypad buttons.

HIGH or LOW

Signal states

courier

Typed text, file names, or file paths. Messages displayed on the graphical user interface.

Glossary of terms Table 1.4

Glossary of terms

Term

Definition

Autotrack function

The autotrack function automatically moves the diaphragms or leaves to their prescribed position.

CCP management panel

A software application which provides the facilities to start and shut down the computers forming the CCP system.

Cal block

The Cal block contains the item and part values that, when loaded, configure the linear accelerator for a given energy.

Document ID: 1531930_05

Elekta Medical Linear Accelerator Clinical Technical Reference Manual

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Introduction Glossary of terms

Term

Definition

Clinical Mode

In Clinical Mode, Clinical Users use the linear accelerator and its accessories for the radiation therapy treatment that a licensed medical practitioner prescribes.

Gating

Gating is the procedure by which an external system or manual task pauses and starts the radiation delivery as a result of information received relating to the treatment position of the patient.

Interdigitation

Interdigitation is an overlap of the opposite adjacent leaves of a multileaf collimator.

Service life

Service life is the length of time that the regular servicing and repair procedures can keep the machine in operation.

Service Mode

In Service Mode, Service Users do the necessary maintenance tasks and calibration of the equipment.

Elekta Medical Linear Accelerator

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Introduction Glossary of terms

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Product Description

2

Product Description

Section

Title

Page

2.1

Available delivery techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.1.1

Description of PreciseBEAM™ Segmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.2

Description of PreciseBEAM™ Dynamic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.1.3

Description of PreciseBEAM™ Dynamic Arc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.1.4

Description of PreciseBEAM™ VMAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16

2.1.5

Description of continuously variable dose rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16

2.2

Agility™ beam limiting device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.3

MLCi2™ beam limiting device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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Product Description

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Product Description Available delivery techniques

2.1

Available delivery techniques The treatment control system supports a number of delivery techniques. These are available in all X-ray energies and include electron treatment. Linear accelerators with the Agility™ beam limiting device (BLD) can also deliver treatments with high dose rate mode (FFF) energies. Software licenses are necessary for the following delivery techniques: •

PreciseBEAM™ Segmental

•

PreciseBEAM™ Dynamic

•

PreciseBEAM™ Dynamic Arc

•

PreciseBEAM™ VMAT

•

HDRE.

You can use continuously variable dose rate (CVDR) for Dynamic, Dynamic Arc, and volumetric intensity modulated arc therapy (VMAT). Note:

2.1.1

When you use new or unusual treatment methods, it is your responsibility to make sure that the linear accelerator can deliver the treatment.

Description of PreciseBEAM™ Segmental In this delivery technique, the system delivers segments with different linear accelerator parameters and MLC shapes. The MLC shape does not change for each irradiation segment. Between the delivery of irradiation segments, some linear accelerator parameters can move or change: •

MLC shape

•

Wedge position

•

Radiation energy

•

Dose rate

•

Gantry angle

•

Collimator angle.

The period of time between the delivery of irradiation segments, when these parameters change, is referred to as Move only segments . An IMRT beam includes irradiation segments and move only segments. The delivery techniques StepNShoot, SkipNScan and Move only arcs use this procedure. PreciseBEAM™ Segmental gives a fully automatic segment delivery sequence to a resolution of 0.1 MU/segment.

2.1.2

Description of PreciseBEAM™ Dynamic PreciseBEAM™ Dynamic adds a function to the PreciseBEAM™ Segmental delivery technique. During irradiation, the MLC leaves move while the gantry is at a specified gantry angle. The MLC leaves move linearly from one shape to the next shape as a function of the delivered dose. You can therefore use a fully automatic segment delivery sequence.

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Product Description Agility™ beam limiting device

2.1.3

Description of PreciseBEAM™ Dynamic Arc PreciseBEAM™ Dynamic Arc extends PreciseBEAM™ Dynamic with the function to rotate the gantry at the same time as you deliver the treatment. During irradiation, and rotation of the gantry, the MLC moves at a constant MU/degree dose rate.

2.1.4

Description of PreciseBEAM™ VMAT PreciseBEAM™ VMAT extends the PreciseBEAM™ Dynamic delivery technique with the function to change the MU/degree as the gantry and collimator rotate. The prescription is delivered in one smooth automatic sequence. The MLC and collimator movements are controlled as a function of the delivered dose. During the VMAT beam delivery, the machine can change these parameters: •

Gantry direction and speed

•

Dose rate

•

Gantry speed and dose rate together

•

Collimator rotation direction and speed

•

Energy.

The gantry speed and dose rate are controlled as a function of the prescribed dose for delivery across a range of MLC shapes and gantry movement. Intersegment breaks are only necessary if one of these parameters has to change: •

Energy

•

Gantry direction

•

Collimator direction

•

Wedge position

•

Delivered dose of more than 1000 MU.

If all the parameters are in tolerance, the linear accelerator continues the irradiation automatically.

2.1.5

Description of continuously variable dose rate PreciseBEAM™ Dynamic, PreciseBEAM™ Dynamic Arc, and PreciseBEAM™ VMAT can use more dose rates with CVDR. In the earlier software releases, up to seven dose rates were available. Integrity™ can select dose rates in steps of 1/256 the maximum dose rate.

2.2

Agility™ beam limiting device The Agility™ beam limiting device (BLD) has 160 leaves in two leaf banks of 80 leaves. Each leaf bank is in a dynamic leaf guide, which can move up to 15 cm. The leaves tips can move up to 20 cm from the dynamic leaf guide. The dynamic leaf guide movement can be enabled during beam delivery and can be combined with leaf movement. The leaves can move 15 cm beyond the central axis when the dynamic leaf guide movement and leaf movement are added. Interdigitation is possible with the Agility™ BLD. Interdigitation is an overlap of the opposite adjacent leaves of a multileaf collimator. Each leaf has a:

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Product Description Agility™ beam limiting device

•

Small motor to move it.

•

Small clearance from the leaf adjacent to it, to keep the friction to a minimum.

•

Vertical face that tilts to follow the divergence of the radiation beam. The leaves at the largest distance from the beam central axis tilt the most.

•

Small tilt away from the radiation beam to keep the radiation leakage to a minimum.

•

Leaf tip curve (170 mm radius) which does not align with the centerline axis of the leaf height. This gives penumbra optimization across the full range of field sizes and offsets.

1 2 3

14

4

13 12

5

11

6

10

9

7

8

0133_LMLA

Figure 2.1

Agility™ BLD (IEC 61217)

(1)

Target block

(2)

Primary filter assembly

(3)

Primary collimator

(4)

Port 1

(5)

Ion chamber

(6)

MLC leaves

(7)

Accessory ring

(8)

Shadow tray

(9)

Crosswire sheet

(10)

Y diaphragms

(11)

Motorized wedge assembly (includes the backscatter plate)

(12)

Secondary filter

(13)

Difference filter

(14)

Port 2

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Product Description MLCi2™ beam limiting device

There are two modes of operation, X-ray mode and electron mode. In each mode of operation, the assemblies change the beam as it goes through them. The beam goes through a sequence of steps when it is in the BLD. Table 2.1

X-ray and electron modes of operation

X-ray mode 1

The beam hits the target and makes a symmetrical X-ray output.

2

The X-rays go through a hole in the primary The selected beam goes through a filter filter assembly. made from an electron scattering material. The filter is known as the primary filter.

3

The primary collimator collimates the X-rays The primary collimator, which can rotate, as follows: collimates the beam through Port 2, which is empty. • High energy X-rays through Port 1, which contains the difference filter (if it is necessary). •

2.3

Electron mode The beam goes through a thin metal window in the target section.

Low energy and high dose rate mode (FFF) X-rays through Port 2, which is empty.

4

The secondary filter makes the X-ray beam The selected beam goes through a filter profile flat. For high dose rate mode (FFF) X- made from an electron scattering material ray energies, the secondary filter does not again. make the X-ray beam profile flat.

5

The X-rays go through the aluminum backscatter plate.

The aluminum backscatter plate is not in the beam path for electron treatment mode.

6

The motorized wedge, if selected, changes the X-ray beam profile.

The motorized wedge is not in the beam path for electron treatment mode.

7

The leaves collimate the X-rays into an irregular shape in the X axis. The diaphragms collimate the X-rays into a rectangular field in the Y axis.

The leaves and diaphragms automatically move to a position in relation to the electron applicator type and energy selected.

8

The X-rays go through the crosswire sheet. The light field shows the position of the isocenter and wedge direction.

The electrons go through the crosswire sheet and the light field shows the position of the isocenter.

9

Optional shadow tray: Lead shielding blocks The selected electron applicator collimates attach to the shadow tray. The shielding the beam again, for the applicable field size. blocks collimate the beam again.

MLCi2™ beam limiting device The MLCi2™ beam limiting device (BLD) has: •

80 leaves, 40 each side.

•

For each leaf, a small motor to move it.

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Product Description MLCi2™ beam limiting device

•

For each leaf, a small clearance from the leaf adjacent to it, to keep the friction to a minimum.

•

A vertical face that tilts to follow the divergence of the radiation beam. The leaves at the largest distance from the beam central axis tilt the most.

Interdigitation is possible with the MLCi2™ BLD. Interdigitation is an overlap of the opposite adjacent leaves of a multileaf collimator.

15

1 2

14

3 4

13 5 6

7

8 9 10 12

11 0132_LMLA

Figure 2.2

MLCi2 cross section

(1)

Primary filter assembly

(2)

Primary collimator

(3)

Port 1

(4)

Secondary filter

(5)

Ion chamber

(6)

Motorized wedge assembly (includes the backscatter plate)

(7)

MLC leaves

(8)

X backup diaphragms (secondary collimators)

(9)

Y diaphragms (secondary collimators)

(10)

Crosswire sheet

(11)

Shadow tray

(12)

Accessory ring

Elekta Medical Linear Accelerator

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Product Description MLCi2™ beam limiting device

(13)

Difference filter

(15)

Target block

(14)

Port 2

There are two modes of operation, X-ray mode and electron mode. In each mode of operation, the MLCi2 assemblies change the beam as it goes through them. The beam goes through a sequence of steps when it is in the BLD. Table 2.2

X-ray and electron modes of operation

X-ray mode

Electron mode

1

The beam hits the target and makes a symmetrical X-ray output.

The beam goes through a thin metal window in the target section.

2

The X-rays go through a hole in the primary filter assembly.

The selected beam goes through a filter made from an electron scattering material. The filter is known as the primary filter.

3

The primary collimator collimates the X-rays as The primary collimator, which can follows: rotate, collimates the beam through Port 2, which is empty. • High energy X-rays through Port 1, which contains the difference filter (if it is necessary). •

Low energy X-rays through Port 2, which is empty.

4

The secondary filter makes the X-rays flat.

The selected beam goes through a filter made from an electron scattering material again.

5

The X-rays go through the aluminum backscatter plate.

The aluminum backscatter plate is not in the beam path for electron treatment mode.

6

The motorized wedge, if selected, changes the X-ray beam profile.

The motorized wedge is not in the beam path for electron treatment mode.

7

The Y and X diaphragms collimate the X-rays into a rectangular field. The MLCi2 leaves can collimate the X-rays into an irregular shape.

The Y and X diaphragms automatically move to a position in relation to the electron applicator type and energy selected. The MLCi2 leaves move to full field size.

8

The X-rays go through the crosswire sheet. The The electrons go through the crosswire light field shows the position of the isocenter sheet and the light field shows the and wedge direction. position of the isocenter.

9

Optional shadow tray: Shielding blocks attach The selected electron applicator to the shadow tray to change the defined shape collimates the beam again, for the of the beam in the rectangular field. The Y and applicable field size. X diaphragms and/or the MLCi2 leaves give the defined beam shape.

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System description

3

System description

Section

Title

Page

3.1

Description and layout of the linear accelerator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.2

Description and layout of the linear accelerator (Elekta Harmony, Elekta Harmony Pro) ...............................................................

24

3.3

Treatment devices and accessories in the treatment room . . . . . . . . . . . . . . . . . . . . .

25

3.3.1

Description of the electron applicator types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

25

3.3.2

Description of the square and rectangular electron applicators . . . . . . . . . . . . . . . . . . . 26

3.3.3

Description of the applicator parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.3.4

Description of the Fitment Number parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.5

Description of the end frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.3.6

Description of the touchguard of the square and rectangular electron applicators . . . . . . 33

3.3.7

Description of the circular electron applicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.8

Description of the touchguard of the circular electron applicators . . . . . . . . . . . . . . . . . 34

3.4

Description of the equipment room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Elekta Medical Linear Accelerator

27

33 34

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System description

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System description Description and layout of the linear accelerator

3.1

Description and layout of the linear accelerator The linear accelerator, treatment table, and imaging hardware are primarily installed in the treatment room. The control systems are in the control room and many of the mechanical parts of the linear accelerator are in the equipment room.

14

13

15

16

12 11

A

17

10

1

19

18

B

9

8

2

7

3

4

C

5

6 012176_004

Figure 3.1

Note:

An example of a linear accelerator configuration

Some of the above equipment is optional. If you have MOSAIQ™ Sequencer that does not run on Windows 10, then use the Independent R&V computer to run MOSAIQ™. Use the CCPMC to access the CCP management panel. (A)

Control room

(B)

Treatment room

(C)

Equipment room/Technical area

(1)

Gantry arm and BLD

(2)

Fascia cover

(3)

Treatment room monitor

(4)

Door 2B

(5)

TRM computer

(6)

Handheld controller

(7)

kV source arm

(8)

MV detector arm

(9)

Treatment table

(10)

CCP cabinet

(11)

CCP Management Computer (CCPMC) (12)

Function keypad

(13)

R&V monitor (MOSAIQ™) (optional)

Beam monitor display module (BMDM)

Elekta Medical Linear Accelerator

(14)

Document ID: 1531930_05

Clinical Technical Reference Manual © Elekta Group 2021. All rights reserved.

Page 23

System description Description and layout of the linear accelerator (Elekta Harmony, Elekta Harmony Pro)

Note:

3.2

(15)

Door 1B (Radiation door)

(16)

Integrity™ primary monitor (plus additional monitors)

(17)

Electron applicator storage and collimator cassette rack

(18)

TRM monitor (optional)

(19)

kV detector arm

Elekta strongly recommends that all the treatment control cabinets and computers are housed in a dedicated cupboard in the control room, or in a dedicated cupboard in an IT server room near the control room.

Description and layout of the linear accelerator (Elekta Harmony, Elekta Harmony Pro) The linear accelerator, treatment table, and imaging hardware are primarily installed in the treatment room. The control systems are in the control room and many of the mechanical parts of the linear accelerator are in the equipment room. 20

21

22

1

2

3

4

19 18 17 5

16

6 7 8 9

A 15

14

13 12

B

C

11 10 0324_LMLA

Figure 3.2

Document ID: 1531930_05

An example of a linear accelerator configuration

Elekta Medical Linear Accelerator Clinical Technical Reference Manual

Page 24

© Elekta Group 2021. All rights reserved.

System description Treatment devices and accessories in the treatment room

Note:

Note:

Some of the above equipment is optional. If you have MOSAIQ™ Sequencer that does not run on Windows 10, then use the Independent R&V computer to run MOSAIQ™. Use the CCPMC to access the CCP management panel. (A)

Control room

(B)

Treatment room

(C)

Equipment room/Technical area

(1)

Gantry arm and BLD

(2)

Fascia cover

(3)

Treatment Setup workspace (TSW) center disc monitor (optional)

(4)

Door to equipment room

(5)

kV source arm

(6)

MV detector arm

(7)

User interface modules

(8)

Treatment table

(9)

Handheld controller

(10)

CCP management computer (CCPMC)

(11)

iViewGT™ control cabinet

(12)

XVI control cabinet (optional)

(13)

CCP cabinet

(14)

Function keypad

(15)

Beam monitor display module (BMDM)

(16)

Door to treatment room

(17)

Integrity™ monitor

(18)

MOSAIQ® monitor

(19)

Imaging monitor

(20)

TSW wall monitor

(21)

TRM monitor

(22)

kV detector arm

Elekta strongly recommends that all the treatment control cabinets and computers are housed in a dedicated cupboard in the control room, or in a dedicated cupboard in an IT server room near the control room.

3.3

Treatment devices and accessories in the treatment room

3.3.1

Description of the electron applicator types The electron applicators help deliver constant, high definition, treatment fields of the necessary dimensions. There are five types of electron applicator: •

Square

•

Rectangular, which includes the short SSD electron applicator for arc therapy

•

Circular

•

Null applicator

•

HDRE.

A blank bottom unit is available for special customizations. Each electron applicator attaches to the BLD with a hook and latch system. The BLD leaves are automatically set to the best position for the selected electron applicator and energy. The default auto-tracking settings for each energy and electron applicator can be changed, in Service Mode, to the best position for the BLD. Contact your Elekta representative to change this setting.

Elekta Medical Linear Accelerator

Document ID: 1531930_05

Clinical Technical Reference Manual © Elekta Group 2021. All rights reserved.

Page 25

System description Treatment devices and accessories in the treatment room

Note:

The auto-tracking default values are in compliance with IEC 60601-2-1 clause 201.10.1.2.103.2.2. If the values of the autotracking settings are greater than the default values supplied by Elekta, the electron applicator must be tested. If necessary, contact your service representative.

Note:

If the autotracking settings are changed, this will change the dose distribution. Any change in the settings must be evaluated by Medical Physics Expert (MPE) before clinical use. You must only use the short SSD electron applicator for electron arc therapy. Elekta recommends that you keep a unique combination of applicator type, size and end frame code for the short SSD electron applicator. The distance from the end of the electron applicator to the target is usually 95 cm. But for arc therapy with the short SSD electron applicator, it is 82 cm. Contact your local Elekta representative for the current part number.

3.3.2

Description of the square and rectangular electron applicators See Table 3.1 for the square and rectangular electron applicators that are available. Table 3.1

Square and rectangular electron applicators

Applicator

Fitment Number Range

Energies 1

X

Y

Square

6

6

1 - 14

4 MeV to 22 MeV

Square

10

10

1 - 14

4 MeV to 22 MeV

Square

14

14

1 - 14

4 MeV to 22 MeV

Square

20

20

1 - 14

4 MeV to 22 MeV

Square

25

25

1 - 14

4 MeV to 22 MeV

Rectangular

20

10

1 - 14

4 MeV to 22 MeV

Rectangular

16

8

1 - 14

4 MeV to 22 MeV

Rectangular

14

6

1 - 14

4 MeV to 22 MeV

Rectangular

10

6

1 - 14

4 MeV to 22 MeV

Short SSD

20

6

1 - 14

4 MeV to 22 MeV

Note: 1

3.3.3

Field Size (cm)

22 MeV only available with MLCi2™ option

Description of the applicator parameter The control system uses the Applicator parameter to identify the electron applicator which is attached to the beam limiting device (BLD). The electron applicators attach to the BLD for electron field delivery only. Table 3.2

Description of the Applicator parameter

Applicator parameter

Description

N x N Square

Square electron applicators, where size = N

N x M Rectangular

Rectangular electron applicators, where size = N × M

Document ID: 1531930_05

Elekta Medical Linear Accelerator Clinical Technical Reference Manual

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© Elekta Group 2021. All rights reserved.

System description Treatment devices and accessories in the treatment room

Applicator parameter

3.3.4

Description

Circular N

Circular electron applicators, where diameter = N

Short SSD

Electron applicator with SSD = 82.0 cm, which Elekta supplies

Null Applicator

Null applicator

HDRE Applicator

HDRE applicator

Description of the Fitment Number parameter The Fitment Number parameter identifies the end frame shape put in the bottom of an electron applicator to give the treatment field shape. See Table 3.3 for the range of valid fitment numbers. See Table 3.4 for the drilling reference. Table 3.3

Fitment Number valid range

Valid Range

Description

0

HDRE applicator

1 - 14

Square or rectangular electron applicators. Code = 1 for a standard size end frame. Code = 2 to 14 for end frames with irregular shapes.

2-5

Circular electron applicators.

0 and 15

Note:

Fault code

You cannot attach an end frame to the HDRE applicator. Table 3.4

Drilling reference

Code number

Drilling reference A

B

C

Code number

Drilling reference

D

A

B

C

D

0

+

+

+

+

8

+

+

+

0

1

0

+

+

+

9

0

+

+

0

2

+

0

+

+

10

+

0

+

0

3

0

0

+

+

11

0

0

+

0

4

+

+

0

+

12

+

+

0

0

5

0

+

0

+

13

0

+

0

0

6

+

0

0

+

14

+

0

0

0

7

0

0

0

+

15

0

0

0

0

Key: +

undrilled (switch pressed)

0

drilled (switch not pressed)

Elekta Medical Linear Accelerator

Document ID: 1531930_05

Clinical Technical Reference Manual © Elekta Group 2021. All rights reserved.

Page 27

System description Treatment devices and accessories in the treatment room

3.3.5

Description of the end frames This is a description of the different types of end frames for radiation therapy. The end frame shapes can be irregular. End frames of standard sizes are available from Elekta. The fitment number code is 1. These are the same nominal size as the electron applicator. It is possible to make irregular end frame shapes from the applicable shielding block material. These have fitment number codes 2 to 14. The irregular end frame shapes can be the same shape as the treatment area. The irregular end frame replaces the standard frame in the end of the electron applicator. The end frame height must be 9.9 ±0.1 mm. There are special verification end frames to use with the Integrity control system. You can use a maximum of 14 fitment number codes for each electron applicator.

3.3.5.1

Description of the end frame coding for the square and rectangular electron applicators Coding holes on the end frame operate the coding switches on the electron applicator to identify the end frame to the TCS when the applicator is fitted to the BLD. Table 3.5

Square and rectangular electron applicator end frame codes

Code description

Code number

Electron applicator attached with end frame fitted incorrectly (fault code)

0

Square and rectangular electron applicators standard end frames

1

Square and rectangular electron applicators custom end frames

2 to 14

Electron applicator attached without end frame fitted (fault code)

15

Elekta supplies end frames at the same nominal size as the electron applicator. It is also possible to make custom irregular end frame shapes from applicable shielding block material. The irregular end frame shapes can be the same shape as the actual treatment area. The irregular end frames replace the standard end frame. You can use a maximum of 14 end frame codes for each electron applicator. Contact your local Elekta representative for information on Aktina electron applicator end frame moulds.

3.3.5.2

Description of the end frame codes on electron applicators To make the code, a maximum of four holes are drilled in a special sequence on the edge of the face of the end frame. The valid range of codes for the end frame is 1 to 14. The tables Table 3.6 to Table 3.10 show the electron applicator and end frame codes. Table 3.11 shows the end frame drilling reference codes.

Document ID: 1531930_05

Elekta Medical Linear Accelerator Clinical Technical Reference Manual

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© Elekta Group 2021. All rights reserved.

System description Treatment devices and accessories in the treatment room Table 3.6

Electron applicator and end frame coding - square electron applicators

Code to DAC Applicator type bits

End frame number

End frame bits D

C

B

A

Code usage

7

6

5

4

3

2

1

0

0

0

-

-

-

-

0

0

1

0

0

1

0

0

0

0

0

Incorrectly installed end frame.

0

0

1

0

0

0

1

1

Standard end frame installed.

0

0

1

0

0

1

0

2

Spare codes for use as necessary.

0

0

1

0

0

1

1

3

0

0

1

0

1

0

0

4

0

0

1

0

1

0

1

5

0

0

1

0

1

1

0

6

0

0

1

0

1

1

1

7

0

0

1

1

0

0

0

8

0

0

1

1

0

0

1

9

0

0

1

1

0

1

0

10

0

0

1

1

0

1

1

11

0

0

1

1

1

0

0

12

0

0

1

1

1

0

1

13

0

0

1

1

1

1

0

14

0

0

1

1

1

1

1

15

Table 3.7

Invalid electron applicator type.

Square

End frame not installed.

Electron applicator and end frame coding - rectangular electron applicators

Code to DAC Applicator type bits

End frame number

End frame bits D

C

B

A

Code usage

7

6

5

4

3

2

1

0

0

0

-

-

-

-

0

1

1

0

1

1

0

0

0

0

0

Incorrectly installed end frame.

0

1

1

0

0

0

1

1

Standard end frame installed.

0

1

1

0

0

1

0

2

Spare codes for use as necessary.

0

1

1

0

0

1

1

3

0

1

1

0

1

0

0

4

0

1

1

0

1

0

1

5

0

1

1

0

1

1

0

6

Elekta Medical Linear Accelerator

Invalid electron applicator type.

Rectangular

Document ID: 1531930_05

Clinical Technical Reference Manual © Elekta Group 2021. All rights reserved.

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System description Treatment devices and accessories in the treatment room

Code to DAC Applicator type bits

End frame number

End frame bits D

C

B

A

7

6

5

4

3

2

1

0

1

1

0

1

1

1

7

0

1

1

1

0

0

0

8

0

1

1

1

0

0

1

9

0

1

1

1

0

1

0

10

0

1

1

1

0

1

1

11

0

1

1

1

1

0

0

12

0

1

1

1

1

0

1

13

0

1

1

1

1

1

0

14

0

1

1

1

1

1

1

15

Table 3.8

End frame not installed.

Electron applicator and end frame coding - circular electron applicators

Code to DAC Applicator type bits

End frame number

End frame bits D

C

B

A

7

6

5

4

3

2

1

0

0

0

-

-

-

-

0

1

0

0

1

0

0

0

0

0

0

0

1

0

0

0

0

1

1

0

1

0

0

0

1

0

2

0

1

0

0

0

1

1

3

0

1

0

0

1

0

0

4

0

1

0

0

1

0

1

5

0

1

0

0

1

1

0

6

0

1

0

0

1

1

1

7

0

1

0

1

0

0

0

8

0

1

0

1

0

0

1

9

0

1

0

1

0

1

0

10

0

1

0

1

0

1

1

11

0

1

0

1

1

0

0

12

0

1

0

1

1

0

1

13

0

1

0

1

1

1

0

14

0

1

0

1

1

1

1

15

1

0

1

Document ID: 1531930_05

Code usage

Code usage

Invalid electron applicator type.

Circular This block is reserved for circular electron applicators.

Circular Elekta Medical Linear Accelerator Clinical Technical Reference Manual

Page 30

© Elekta Group 2021. All rights reserved.

System description Treatment devices and accessories in the treatment room

Code to DAC Applicator type bits

End frame number

End frame bits D

C

B

A

Code usage

7

6

5

4

3

2

1

1

0

1

0

0

0

0

0

Fault.

1

0

1

0

0

0

1

1

Spare code.

1

0

1

0

0

1

0

2

2 cm end tube installed.

1

0

1

0

0

1

1

3

3 cm end tube installed.

1

0

1

0

1

0

0

4

4 cm end tube installed.

1

0

1

0

1

0

1

5

5 cm end tube installed.

1

0

1

0

1

1

0

6

Spare codes.

1

0

1

0

1

1

1

7

1

0

1

1

0

0

0

8

1

0

1

1

0

0

1

9

1

0

1

1

0

1

0

10

1

0

1

1

0

1

1

11

1

0

1

1

1

0

0

12

1

0

1

1

1

0

1

13

1

0

1

1

1

1

0

14

1

0

1

1

1

1

1

15

Table 3.9

Fault.

Electron applicator and end frame coding - null (blank) electron applicators

Code to DAC Applicator type bits

End frame number

End frame bits D

C

B

A

Code usage

7

6

5

4

3

2

1

0

0

0

-

-

-

-

1

0

0

1

0

0

0

0

0

0

0

Incorrectly installed end frame.

1

0

0

0

0

0

1

1

Spare codes for use as necessary.

1

0

0

0

0

1

0

2

1

0

0

0

0

1

1

3

1

0

0

0

1

0

0

4

1

0

0

0

1

0

1

5

1

0

0

0

1

1

0

6

1

0

0

0

1

1

1

7

1

0

0

1

0

0

0

8

1

0

0

1

0

0

1

9

Elekta Medical Linear Accelerator

Invalid electron applicator type.

Null

Document ID: 1531930_05

Clinical Technical Reference Manual © Elekta Group 2021. All rights reserved.

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System description Treatment devices and accessories in the treatment room

Code to DAC Applicator type bits

End frame number

End frame bits D

C

B

A

7

6

5

4

3

2

1

1

0

0

1

0

1

0

10

1

0

0

1

0

1

1

11

1

0

0

1

1

0

0

12

1

0

0

1

1

0

1

13

1

0

0

1

1

1

0

14

1

0

0

1

1

1

1

15

Table 3.10

Code usage

End frame not installed.

Electron applicator and end frame coding - spare codes

Code to DAC Applicator type bits

End frame number

End frame bits D

C

B

A

7

6

5

4

3

2

1

0

0

0

-

-

-

-

1

1

0

1

1

0

0

0

0

0

0

1

1

0

0

0

0

1

1

1

1

0

0

0

1

0

2

1

1

0

0

0

1

1

3

1

1

0

0

1

0

0

4

1

1

0

0

1

0

1

5

1

1

0

0

1

1

0

6

1

1

0

0

1

1

1

7

1

1

0

1

0

0

0

8

1

1

0

1

0

0

1

9

1

1

0

1

0

1

0

10

1

1

0

1

0

1

1

11

1

1

0

1

1

0

0

12

1

1

0

1

1

0

1

13

1

1

0

1

1

1

0

14

1

1

0

1

1

1

1

15

1

1

1

Code usage

Invalid electron applicator type.

Spare code

Spare code Use not allocated.

Invalid

Key to Table 3.11 + Denotes hole not drilled (switch pressed) Document ID: 1531930_05

Elekta Medical Linear Accelerator Clinical Technical Reference Manual

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System description Treatment devices and accessories in the treatment room

0 Denotes hole drilled (switch not pressed) Table 3.11

Drilling reference

Code number

3.3.6

Drilling reference A

B

C

D

0

+

+

+

+

1

0

+

+

2

+

0

3

0

4

Code number

Drilling reference A

B

C

D

8

+

+

+

0

+

9

0

+

+

0

+

+

10

+

0

+

0

0

+

+

11

0

0

+

0

+

+

0

+

12

+

+

0

0

5

0

+

0

+

13

0

+

0

0

6

+

0

0

+

14

+

0

0

0

7

0

0

0

+

15

0

0

0

0

Description of the touchguard of the square and rectangular electron applicators The square and rectangular electron applicators have spring-loaded pillars which hold the end frames. When the end frames apply pressure to the pillars, the springs compress and operate as a touchguard. If the springs compress by more than 3 mm to 5 mm (nominal), they activate a microswitch. The microswitch stops all motor drives to the linear accelerator and treatment table, and the system terminates the radiation delivery.

3.3.7

Description of the circular electron applicators The circular electron applicators have four end tubes made of stainless steel. Each end tube has an identification code. The end tubes are available in a range of inner diameters: 2 cm, 3 cm, 4 cm, and 5 cm. The circular electron applicators are identified with 2, 3, 4, and 5, which is their size in centimeters. Table 3.12

Circular electron applicators

Applicator

Field Size (cm)

Fitment Number Range

Energies (1)

X

Y

Circular

2

2

2

4 MeV to 22 MeV

Circular

3

3

3

4 MeV to 22 MeV

Circular

4

4

4

4 MeV to 22 MeV

Circular

5

5

5

4 MeV to 22 MeV

Note: 1 22 MeV only available with MLCi2™ option

Elekta Medical Linear Accelerator

Document ID: 1531930_05

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System description Description of the equipment room

3.3.8

Description of the touchguard of the circular electron applicators The interchangeable end tubes each fit into a spring-loaded retainer mechanism. The mechanism activates the touchguard microswitch when the end tube compresses the spring-loaded retainer mechanism by 8 mm to 10 mm (nominal).

3.4

Description of the equipment room The equipment room contains the technical equipment needed for the linear accelerator. It is generally only accessed during servicing and maintenance.

Document ID: 1531930_05

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Technical description

4

Technical description

Section

Title

Page

4.1

Technical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

4.1.1

Physical data for the linear accelerator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

4.1.2

Cool water supply limits for the linear accelerator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.1.3

Gas supplies for the linear accelerator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

42

4.1.4

Electrical data for the linear accelerator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

42

4.1.5

Description of the wedge angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

4.1.6

Description of the function keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

4.1.7

Description of how the leaf positions are specified in Receive External Prescription and monitored . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

4.1.8

Description of the tolerance checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2

Agility™ technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

4.2.1

Technical description of the Y diaphragms of Agility™ . . . . . . . . . . . . . . . . . . . . . . . . . . 51

4.2.2

Technical description of the leaf position limits of Agility™ . . . . . . . . . . . . . . . . . . . . . .

4.3

MLCi2™ technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

4.3.1

Technical description of the leaf position limits of MLCi2™ . . . . . . . . . . . . . . . . . . . . . .

52

4.3.2

MLCi2™ maximum field size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

53

4.4

Scales and ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

54

4.4.1

Speed and accuracy of the movement of the Agility™ leaves . . . . . . . . . . . . . . . . . . . . . 54

4.4.2

Speed and accuracy of the diaphragm movement for Agility™ . . . . . . . . . . . . . . . . . . . . 54

4.4.3

Speed and accuracy of the movement of the MLCi2™ leaves . . . . . . . . . . . . . . . . . . . . . 54

4.4.4

Speed and accuracy of the diaphragm movement for MLCi2™ . . . . . . . . . . . . . . . . . . . . 54

4.4.5

Range of gantry rotation speed in relation to the dose rate in arc therapy mode . . . . . . . 54

4.4.6

Isocenter accuracy of the linear accelerator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55

4.4.7

Description of the gantry angle and gantry movement parameters . . . . . . . . . . . . . . . .

55

4.4.8

Diaphragm and leaf parameters for Agility™ and MLCi2™ . . . . . . . . . . . . . . . . . . . . . . . 55

4.4.9

Default ranges of parameters in the IEC 61217 coordinate system for Agility . . . . . . . . .

56

4.4.10

Default ranges of parameters in the IEC 61217 coordinate system for MLCi2™ . . . . . . . .

56

4.4.11

Default ranges of parameters in the Bipolar coordinate system for Agility™ . . . . . . . . . .

57

4.4.12

Default ranges of parameters in the Bipolar coordinate system for MLCi2™ . . . . . . . . . .

57

4.4.13

Range of movement of leaves in IEC 61217 coordinate system . . . . . . . . . . . . . . . . . . .

58

4.4.14

Range of movement of leaves in the IEC 60601-2-1 and Bipolar coordinate systems . . . .

59

4.4.15

Range of movement of diaphragms in the IEC 61217 coordinate system . . . . . . . . . . . . . 60

4.4.16

Range of movement of diaphragms in the IEC 60601-2-1 and Bipolar coordinate systems

4.5

Shadow trays and electron applicators technical data . . . . . . . . . . . . . . . . . . . . . . . . . 62

4.5.1

Standard shadow tray assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

4.5.2

Short shadow tray assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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61

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Technical description

4.5.3

Electron applicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.5.4

Weights and dimensions of the square and rectangular electron applicators . . . . . . . . . . 71

4.5.5

Weights and dimensions of the circular electron applicator . . . . . . . . . . . . . . . . . . . . . . 71

4.5.6

Shadow tray parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.5.7

Description of the identification codes for coded acrylic trays . . . . . . . . . . . . . . . . . . . . 72

4.5.8

Description of the auto field correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.6

Radiation data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

4.6.1

Description of the radiation data for the linear accelerator . . . . . . . . . . . . . . . . . . . . . . 74

4.6.2

Energy parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.6.3

Description of the physical motorized wedge parameter . . . . . . . . . . . . . . . . . . . . . . . . 75

4.6.4

Technical description of the prescribed MU parameter . . . . . . . . . . . . . . . . . . . . . . . . . 75

4.6.5

Technical description of the backup MU parameter . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.6.6

Description and operation of the dose rate parameter . . . . . . . . . . . . . . . . . . . . . . . . . 76

4.6.7

Example of the standard dose rate for a three control point, two segment, dynamic field for Agility™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

78

4.6.8

Example of the standard dose rate for a multi-segment field for Agility™ . . . . . . . . . . . .

79

4.6.9

Description and operation of the beam timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

81

4.7

Environmental conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

82

4.7.1

Environmental conditions for the EMLA system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

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71 73

75

76

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Technical description Technical description

4.1

Technical description

4.1.1

Physical data for the linear accelerator See Figure 4.1 and Table 4.1 for the nominal dimensions of the linear accelerator. The nominal total weight of the linear accelerator is 5500 kg.

3558 mm

2488 mm

3868 mm

004013

Figure 4.1

©2012 Elekta Limited

Dimensions of the linear accelerator

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Technical description Technical description Table 4.1

Item

4.1.1.1

Dimensions of the linear accelerator

Value (mm)

Length

3558

Width

3868

Height

2488

Physical data for the Elekta Harmony and Elekta Harmony Pro linear accelerator See Figure 4.2 and Table 4.2 for the nominal dimensions of the linear accelerator. The net weight of the linear accelerator for a one-piece installation (not including the treatment table, iViewGT, or XVI) is around 5400 kg, and the gross weight is 6200 kg.

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Technical description Technical description

3581 mm

2736 mm

2472 mm

0025_LBMS

Figure 4.2

Dimensions of the linear accelerator

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Technical description Technical description Table 4.2

Item

4.1.1.2

Dimensions of the linear accelerator

Value (mm)

Length

3581

Width

2736

Height

2472

Physical data for the Agility™ beam limiting device See Figure 4.3 for the Agility™ primary collimator dimensions. All dimensions are in millimeters. The collimator can rotate.

005049_001

Figure 4.3

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Agility™ primary collimator dimensions

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Technical description Technical description

(1)

Electron window

(2)

Target position

(3)

Collimator

See Figure 4.4 for the Agility™ BLD dimensions.

005051_001

Figure 4.4

4.1.1.3

Agility™ BLD dimensions

Linear accelerator nominal parameters Table 4.3

Nominal parameters

Description

Value

Distance from the target to the isocenter

1000 mm

Distance from the electron window to the isocenter

1000 mm

Distance from the accessory ring to the isocenter

450 mm

Height of the isocenter above the floor

1240 mm

Direction of the useful beam

Radially through 360° in the perpendicular plane to the axis of the gantry, in the direction of the isocenter.

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Technical description Technical description

4.1.1.4

Physical dimensions Table 4.4

Dimensions and weights

Item

4.1.2

Length (mm)

Width (mm)

Height (mm)

Weight (kg)

Beam monitor display module (BMDM)

133

80

37

0.25

Function keypad (FKP)

250

210

100

2

HDRE keypad

216

120

46

2

Response™ control module

158

90

35

0.25

Cool water supply limits for the linear accelerator Table 4.5

Water supply to the heat exchanger assembly

Properties

4.1.3

Limits

Flow maximum

30 L/min at 20 °C

Inlet pressure

400 kPa (4 bar) maximum

Gas supplies for the linear accelerator Table 4.6

Gas supplies for the rectangular waveguide and the vacuum system

Supply

4.1.4

Data

SF6 dielectric gas

99.9% pure

Dry nitrogen (no oxygen)

99.9% pure

Electrical data for the linear accelerator The linear accelerator uses an external isolator to isolate it from the mains electrical supply. The user supplies the external isolator. The location of the external isolator changes with the installation. It is usually behind the linear accelerator or in, or near, the control room. Table 4.7

Electrical data, specification of three-phase mains electrical supply

Description

Value

No load mains voltage (average)

400 V

Voltage range

380 V to 440 V

Input mains voltage variation

±10%1

Phases

Three-phase plus neutral and earth, 5-wire

Frequency

50 Hz or 60 Hz, ±2%

Highest permitted internal impedance of electrical supply

0.2 ohm

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Technical description Technical description

Description

Value

Over current protection:

4.1.4.1

Machine only

45 A rms for each phase

Machine plus optional water cooler2

60 A rms maximum for each phase

Rated input (machine only)

30 kVA

Power factor (full load)

> 0.9

1

If greater than ±10%, Elekta can supply a voltage stabilizer.

2

60 A rms for each phase only when one over current protection device is used.

Electrical data for the treatment control cabinet Table 4.8

Electrical supply

Supply

4.1.5

Data

Voltage range

207 V to 253 V

Input mains voltage stability

230 V ±10%

Phases

Single-phase

Frequency

50 Hz or 60 Hz, ±2%

Rated input

16.0 A

Description of the wedge angle The wedge angle is the angle between the wedged beam and open beam isodose at the beam central axis, at a depth of 10 cm in a water phantom (see Figure 4.5). The linear accelerator has a motorized physical wedge, which produces a dose distribution with a maximum wedge angle of 60°. Different effective wedge angles can be obtained by combining an open field with a fully wedge field.

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Technical description Technical description 0.0

0.0

4.0

4.0

8.0

8.0 30°

45° 12.0

Depth (cm)

Depth (cm)

12.0

16.0

16.0

20.0

20.0

24.0

24.0

28.0

28.0

32.0 -8.0

-4.0

0

4.0

8.0

Distance from central axis (cm) (a)

32.0 -12.0

-8.0

-4.0

0

4.0

(b) 001631

Figure 4.5

Note:

8.0

Distance from central axis (cm) ©2011 Elekta Limited

Wedge angle example

The wedge angle is 60° for the measurement conditions. It is a fully wedged beam. Figure 4.6, Figure 4.7, and Figure 4.8 show the isodoses normalized to the depth of the maximum dose of the open beam. The dose is weighted to the same point in each figure. The settings are: •

8 MV beam

•

100 cm SSD

•

10 cm × 10 cm field.

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Technical description Technical description

3 Sagittal X =+0.00 cm

001678

Figure 4.6

©2011 Elekta Limited

Fully wedged beam

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Technical description Technical description

3 Sagittal X =+0.00 cm

001679

Figure 4.7

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©2011 Elekta Limited

Open beam

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Technical description Technical description

3 Sagittal X =+0.00 cm

*

001680

Figure 4.8

4.1.5.1

©2011 Elekta Limited

Effective wedged beam

Deriving the effective wedge angle The effective wedge angle can be calculated from the doses for the fully wedged beam and the open beam. Dt = Do + Dw F = Dw/Dt tan

= F x tan ( )

Where: =

the maximum wedge angle (for a specified field size and depth).

=

the effective wedge angle (defined at the same field size and depth as for ).

Dt

=

the total dose received on the beam central axis at depth d.

Dw

=

the dose that the wedged beam segment receives on the beam central axis at depth d.

Do

=

the dose that the open beam segment receives on the beam central axis at depth d.

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Technical description Technical description

Alternatively, the ratio of doses can be calculated from: F = tan

/ tan ( )

Dw = Dt * F Do = Dt - Dw For example: Prescribed dose

=

2.0 Gy

Field size

=

10 cm × 10 cm

SSD

=

100 cm

Maximum wedge angle at 10 cm depth

=

60°

Necessary effective wedge angle

=

20°

1

Calculate these values from the above relations, for example: Dt

=

2.00 Gy

F

=

tan20° ÷ tan60°

=

0.210

Dw

=

2.00 Gy × 0.210

=

0.420 Gy

Do

=

2.00 Gy – 0.420 Gy

=

1.580 Gy

Therefore, to calculate an effective wedge angle, , of 20°, the: –

Dose from the open segment to the specified depth (Do) must be 1.580 Gy

–

Dose from the wedge segment (Dw) must be 0.420 Gy.

Note:

The formulae above are only correct for the depth and field size at which the maximum wedge angle ( ) is specified. You can use the same formulae to calculate the effective wedge angle from a known ratio of open beam (Do) and wedged beam (Dw) dose segments.

Note:

You can calculate the effective wedge angles with other formulae. Be careful when you compare the results from the different formulae, because the results can come from very different standards and definitions.

4.1.6

Description of the function keypad The function keypad (FKP) in the control room lets you start, pause, and stop kV and MV radiation. You can also use the FKP for automatic setup of the gantry, collimator, and treatment table. The FKP has a button to retract the MV detector panel from the control room. Each configuration of the linear accelerator has a different FKP. Not all function keypads have kV buttons. On some FKPs, the colors of the buttons can be different, but their function stays the same. There is also a legacy FKP. The legacy FKP controls are referred to by the names of the buttons on the current FKP. For example, the:

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Technical description Technical description

4.1.7

•

INTERRUPT button is referred to as the MV INTERRUPT button.

•

AUTO button is referred to as the ENABLE button.

•

START button is referred to as the MV START button.

Description of how the leaf positions are specified in Receive External Prescription and monitored The R&V system sends a prescription to Receive External Prescription (REP), to give the specified leaf positions. An optical system monitors the correct position of the leaves. If the optical system finds a leaf position error during treatment, the linear accelerator immediately causes an interruption of the radiation delivery and changes to the Interrupted machine state.

4.1.8

Description of the tolerance checks The system uses the specified values in the tolerance tables to do the tolerance checks. These checks compare the difference between the Actual values and the Set prescribed values. The system uses the tolerance tables at: •

Setup, for manual movement and ASU.

•

Intersegment, at the end of each delivery segment.

•

Field interruption.

During the Field setup, the MOSAIQ® SEQUENCER™ can prevent the move to the Ready to Start machine state until the Field Actual values are in a setup tolerance of the prescribed Set values. The MOSAIQ® setup tolerances are special to the selected Field and are only used by the MOSAIQ® SEQUENCER™ to do a check of the setup of the first Field segment (for all treatment Field delivery types). The MOSAIQ® setup tolerances are not communicated to Integrity™ and the MOSAIQ® SEQUENCER™ does not do a check of them during radiation delivery. Integrity™ also prevents a Ready to Start machine state for all delivery types until all Field Actual and Set values are in the iCom tolerances for that radiation type. The MOSAIQ® setup tolerance and Integrity™ iCom tolerances apply until the machine state changes from Ready to Start to Radiation On. If the subsequent radiation delivery is interrupted or terminated, the MOSAIQ® SEQUENCER™ or Integrity™ can prevent the change of the machine state to Ready to Start. This applies until all the Actual and Set values are in Integrity™ iCom tolerances and the MOSAIQ® setup tolerance, for the current delivery segment (for all MOSAIQ SEQUENCER™ Field delivery types). After the machine state is Radiation On, Integrity™ does checks to make sure that all the delivery Field Actual and Set values are in a set of internal tolerances. You cannot configure these parameters. Integrity™ does checks to make sure that the parameters are in tolerance for all radiation delivery techniques, independently of the connected R&V system (for example, a MOSAIQ® SEQUENCER™). If a machine parameter is not in the internal tolerance, Integrity™ does a pause of the radiation delivery and waits for a maximum of 25 seconds for the parameter to come back into tolerance. If it does not, the delivery is terminated. The system does a check against the tolerance tables at each machine state change of the linear accelerator during treatment delivery, for example at a control point boundary. At this time, delivery warden also does its check of the permitted tolerances, and if it is necessary delivery warden tells Integrity to terminate the radiation delivery.

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Technical description Technical description

4.1.8.1

Tolerance tables The tolerance tables show the default values, and the range of the permitted values, for a linear accelerator with an Agility™ or an MLCi2™ beam limiting device. You can change the default values, but you cannot erase them. Table 4.9

Default values for tolerance tables

Parameter

Default values X-ray

Electron

Service 1

iCom

Diaphragm Y2 (cm)

0.10

0.10

0.20

0.20

Diaphragm Y1 (cm)

0.10

0.10

0.20

0.20

Diaphragm X2 (cm)

0.10

0.10

0.20

0.20

Diaphragm X1 (cm)

0.10

0.10

0.20

0.20

Fieldsize X (cm)

0.20

0.20

0.20

0.20

Fieldsize Y (cm)

0.20

0.20

0.20

0.20

Field Offset X (cm)

0.20

0.20

0.20

0.20

Field Offset Y (cm)

0.20

0.20

0.20

0.20

Collimator Angle (°)

2.0

3.0

2.0

2.0

Gantry Angle (°)

2.0

3.0

2.0

2.0

Table Vertical (cm)

5.0

5.0

1.0

1.0

Table Lateral (cm)

5.0

5.0

2.0

1.0

Table Longitudinal (cm)

5.0

5.0

2.0

1.0

Column Rotation (°)

2.0

2.0

2.0

1.0

Isocentric Rotation (°)

2.0

5.0

2.0

1.0

Table 4.10

Permitted values for the tolerance tables for a linear accelerator with an Agility™ BLD

Parameter

Permitted value range

Diaphragm Y2 (cm)

0 - 0.20

Diaphragm Y1 (cm)

0 - 0.20

Diaphragm X2 (cm)

N/A

Diaphragm X1 (cm)

N/A

Fieldsize X (cm)

N/A

Fieldsize Y (cm)

N/A

Field Offset X (cm)

N/A

Field Offset Y (cm)

N/A

Collimator Angle (°)

0 - 3.0

Gantry Angle (°)

0 - 3.0

Table Vertical (cm)

0 - 99.9

Table Lateral (cm)

0 - 99.9

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Technical description Agility™ technical data

Parameter

Permitted value range

Table Longitudinal (cm)

0 - 99.9

Column Rotation (°)

0 - 2.0

Isocentric Rotation (°)

0 - 359.0

4.2

Agility™ technical data

4.2.1

Technical description of the Y diaphragms of Agility™ The Y diaphragms let continuous field size adjustments occur in the Y direction. Without these diaphragms, the adjustments will be in 5 mm steps. During treatment setup, the diaphragms automatically move to a position specified by the prescription sent from the R&V system to Receive External Prescription. The field is specified by the MLC assembly.

4.2.2

Technical description of the leaf position limits of Agility™ You can put the leaves at any position in the prescribed field size, if these conditions are met: •

There must be a prescribed value for all the leaves.

•

The maximum distance between the most extended and most retracted leaves is 20 cm for each leaf bank.

•

The limit of travel across the beam central axis is 15 cm.

There is a minimum physical gap of 1 mm between leaf tips. This is measured at the leaf bank. The minimum leaf gap measurement at the isocenter is important for the treatment planning system (TPS), see the TPS documentation for more information. The field size in the Y direction is specified by the Y diaphragms and not the position of the outer leaves. In a specified 40 cm × 40 cm field size, the leaves at the edge of the field have the restricted maximum leaf positions. See Table 4.11 for the actual values of the leaf limits. Table 4.11

Actual values of the leaf limits that will be rounded

Leaves 1 and 80

16.1 cm

Leaves 2 and 79

16.7 cm

Leaves 3 and 78

17.3 cm

Leaves 4 and 77

17.8 cm

Leaves 5 and 76

18.3 cm

Leaves 6 and 75

18.8 cm

Leaves 7 and 74

19.2 cm

Leaves 8 and 73

19.7 cm

All other leaves have a maximum value of 20 cm. See Figure 4.9 for the leaf positions.

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Technical description MLCi2™ technical data

40 cm

40 cm 005126_003

Figure 4.9

Actual leaf limits

4.3

MLCi2™ technical data

4.3.1

Technical description of the leaf position limits of MLCi2™ You can put the leaves anywhere in the prescribed field size, if these conditions are met: •

A minimum of one leaf must be put in position at each field edge X2 and X1.

•

The limit of travel across the beam central axis is 12.5 cm.

•

When the Calculate Backup Diaphragms parameter is set to move diaphragms to the prescribed positions, there must be a value for each position.

The Calculate Backup Diaphragms parameter in Integrity™ controls the movements of the X1 and X2 diaphragms. Two configuration options are available from the iCom tab of the Configuration Utility: •

No - Moves the diaphragms to the prescribed positions.

•

Yes - Diaphragms follow the position of the outer open leaf of the radiation field.

If you do not have an interdigitation license, there must be a prescribed value for the minimum separation between two opposite leaves and their adjacent leaves to prevent collisions. It is set at a nominal 5 mm, but can be configured. This fixed separation is used in all conditions, regardless of offset or gantry angle.

X1

X2

1 2

6

3 4 5 0153_LMLA

Figure 4.10

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Minimum leaf separation at beam central axis

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Technical description MLCi2™ technical data

(1)

Leaf pair n-1

(2)

Leaf pair n

(3)

Leaf pair n+1

(4)

Leaf separation

(5)

Beam central axis

(6)

Leaf pair n

X1

X2

1 2

6

3 4 5 0154_LMLA

Figure 4.11

4.3.2

Effective leaf separation

(1)

Leaf pair n-1

(2)

Leaf pair n

(3)

Leaf pair n+1

(4)

Projected separation

(5)

Beam central axis

(6)

Leaf pair n

MLCi2™ maximum field size If a 40 cm × 40 cm field size is specified, then the MLCi2 leaves at the edge of the field are subject to rounding (see Figure 4.12). The actual limits are: •

Leaves 1 and 40: 16.4 cm

•

Leaves 2 and 39: 17.5 cm

•

Leaves 3 and 38: 18.4 cm

•

Leaves 4 and 37: 19.5 cm

All other leaves have a maximum value of 20 cm.

40 cm

40 cm 005126_003

Figure 4.12

Actual leaf limits

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Technical description Scales and ranges

4.4

Scales and ranges

4.4.1

Speed and accuracy of the movement of the Agility™ leaves Table 4.12

Speed and accuracy of the leaves movement

Speed1

0 to 6.5 cm/s

Leaf position accuracy

1 mm at isocenter, 0.5 mm RMS

Leaf position repeatability

< 0.5 mm

1

The maximum speed is the leaf movement speed of 3.5 cm/s added to the dynamic leaf guide movement speed of 3.0 cm/s. The usual speed of the leaves is less than the maximum speed.

4.4.2

Speed and accuracy of the diaphragm movement for Agility™ Table 4.13

Speed and accuracy of the diaphragm movement

Speed1

0 to 9.0 cm/s

Position accuracy

1 mm at isocenter

1

The maximum speed for the diaphragms is 9 cm/s when positioning without radiation. When used in a dynamic treatment with radiation the speed is restricted to 3.5 cm/s.

4.4.3

Speed and accuracy of the movement of the MLCi2™ leaves Table 4.14

4.4.4

Speed

0 to 2.0 cm/s

Position accuracy

1.5 mm at isocenter

Speed and accuracy of the diaphragm movement for MLCi2™ Table 4.15

4.4.5

Speed and accuracy of the leaves movement

Speed and accuracy of the diaphragm movement

Speed

0 to 1.5 cm/s

Position accuracy

1 mm at isocenter

Range of gantry rotation speed in relation to the dose rate in arc therapy mode In the arc therapy mode, the gantry rotation speed is automatically selected to minimize the treatment time, taking into account other speed constrains such as required leaf movement or dose rate.

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Technical description Scales and ranges

All scales are in compliance with IEC standards. The beam rotates radially through 360° in the direction of the isocenter. The plane of rotation is perpendicular to the gantry axis. All data is nominal. Note:

All movements are continuously variable. The maximum gantry rotation speed is one revolution per minute. Related Links: Description and operation of the dose rate parameter on page 76

4.4.6

Isocenter accuracy of the linear accelerator For the isocenter accuracy of the linear accelerator, the intersection of the rotation axes of the gantry and the BLD must be in a sphere with a radius of 2 mm (nominal).

4.4.7

Description of the gantry angle and gantry movement parameters The gantry angle parameter identifies the angular position of the gantry from the vertical plane. The gantry movement parameter identifies the direction of rotation of the gantry for arc treatments. Table 4.16

Gantry movement parameter

Value

Description

CW

Clockwise

CC

Counterclockwise

NONE

No rotation

The gantry angles (start and stop angles) are related to the direction of the gantry movement. For example, for an Arc template (IEC 61217), if the gantry movement is CW, then: •

The gantry angle control pointer CP1 is 0.0°

•

The maximum gantry stop angle is 181°.

The gantry movement is related to the prescribed MU through the total number of degrees in the arc. The prescribed MU must be a minimum of 0.1 MU for each 1° of gantry rotation.

4.4.8

Diaphragm and leaf parameters for Agility™ and MLCi2™ The diaphragm and leaf parameters give the specified distance (cm) of the field edge or leaf position from the isocenter. The field offset parameters give the specified distance (cm) of the center point of the field edges from the isocenter. The maximum field size in the X or Y direction is 40.0 cm with a field offset of 0.0 cm. As the offset increases, the available maximum square field decreases.

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Technical description Scales and ranges Table 4.17

Example of field size related to field offset (IEC 61217)

If Agility™ MLCi2™

Field offset X = -17.5 cm (maximum)

Maximum field size X = 5.0 × 5.0 cm

Field offset Y = -16.0 cm (maximum)

Maximum field size X = 8.0 × 8.0 cm

Field offset X = ±16.25 cm (maximum) Maximum field size X = 7.5 × 7.5 cm Field offset Y = ±10.0 cm (maximum)

4.4.9

Then

Maximum field size X = 20.0 × 20.0 cm

Default ranges of parameters in the IEC 61217 coordinate system for Agility Table 4.18

Default ranges IEC 61217

Parameter

4.4.10

Range

Diaphragm Y2 (cm)

-12.0

+20.0

Diaphragm Y1 (cm)

-20.0

+12.0

Leaves X2 (cm)

-15.0

20.0

Leaves X1 (cm)

-20.0

15.0

Fieldsize X (cm)

+0.5

+40.0

Fieldsize Y (cm)

+0.5

+40.0

Field Offset X (cm)

-17.5

17.5

Field Offset Y (cm)

-16.0

+16.0

Collimator Angle (°)

0

359.9

Gantry Clockwise Swing (°)

181.0

Gantry Counterclockwise Swing (°)

181.0

Default ranges of parameters in the IEC 61217 coordinate system for MLCi2™ Table 4.19

Default ranges IEC 61217

Parameter

Range

Diaphragm Y2 (cm)

-0.0

+20.0

Diaphragm Y1 (cm)

-20.0

+0.0

Leaves X2 (cm)

-12.5

20.0

Leaves X1 (cm)

-20.0

12.5

Fieldsize X (cm)

+0.5

+40.0

Fieldsize Y (cm)

+0.5

+40.0

Field Offset X (cm)

-16.2

+16.2

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Technical description Scales and ranges

Parameter

Range

Field Offset Y (cm)

-10.0

+10.0

Collimator Angle (°)

0

359.9

Gantry Clockwise Swing (°)

181

Gantry Counterclockwise Swing (°)

181

Related Links: Range of movement of leaves in IEC 61217 coordinate system on page 58

4.4.11

Default ranges of parameters in the Bipolar coordinate system for Agility™ Table 4.20

Default ranges Bipolar

Parameter

4.4.12

Range

Diaphragm X1 (cm)

-12.0

20.0

Diaphragm X2 (cm)

20.0

-12.0

Leaves Y1 (cm)

-15

20

Leaves Y2 (cm)

20.0

-15

Fieldsize Y (cm)

0.5

40.0

Fieldsize X (cm)

0.5

40.0

Field Offset Y (cm)

-17.5

17.5

Field Offset X (cm)

-16.0

16.0

Collimator Angle (°)

0.0

-0.1

Gantry Clockwise Swing (°)

0.0

181.0

Gantry Counterclockwise Swing (°)

0.0

-181.0

Default ranges of parameters in the Bipolar coordinate system for MLCi2™ Table 4.21

Default ranges Bipolar

Parameter

Range

Diaphragm X1 (cm)

0

20.00

Diaphragm X2 (cm)

20.00

0

Leaves Y1 (cm)

-12.5

20.0

Leaves Y2 (cm)

20

-12.5

Fieldsize Y (cm)

0.5

40.00

Fieldsize X (cm)

0.5

40.00

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Technical description Scales and ranges

Parameter

4.4.13

Range

Field Offset Y (cm)

-16.2

16.2

Field Offset X (cm)

-10

10

Collimator Angle (°)

0.0

-0.1

Gantry Clockwise Swing (°)

181.0

Gantry Counterclockwise Swing (°)

-181.0

Range of movement of leaves in IEC 61217 coordinate system The illustrations in this topic are for the Agility™ beam limiting device (BLD) only. The same coordinate system applies to MLCi2™ with the corresponding ranges, see Default ranges of parameters in the IEC 61217 coordinate system for MLCi2™. All movements are continuously variable. All scales are in compliance with IEC 61217 standard. The beam rotates radially through 360° in the direction of the isocenter. The plane of rotation is perpendicular to the gantry axis. All data is nominal. The X1 and X2 parameters give the specified distance (cm) between the edge of the field and the isocenter. The X1 and X2 parameters are related. Gray areas show the maximum range of movement for each diaphragm or leaf.

005136_001

Figure 4.13

X1 range (view from the target of the X1 and X2 parameters) in IEC 61217 coordinate system

Figure 4.14

X2 range (view from the target of the X1 and X2 parameters) in IEC 61217 coordinate system

005139_001

Related Links: Default ranges of parameters in the IEC 61217 coordinate system for MLCi2™ on page 56

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Technical description Scales and ranges

4.4.14

Range of movement of leaves in the IEC 60601-2-1 and Bipolar coordinate systems The illustrations in this topic are for the Agility™ beam limiting device (BLD) only. The same coordinate system applies to MLCi2™ with the corresponding ranges, see Default ranges of parameters in the IEC 61217 coordinate system for MLCi2™. Gray areas show the maximum range of movement for each diaphragm or leaf.

005132_001

Figure 4.15

Y1 range (view from the target of the Y1 and Y2 leaves) in IEC 60601-2-1 coordinate system

005131_001

Figure 4.16

Y1 range (view from the target of the Y1 and Y2 leaves) in Bipolar coordinate system

Figure 4.17

Y2 range (view from the target of the Y1 and Y2 leaves) in IEC 60601-2-1 coordinate system

005135_001

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Technical description Scales and ranges

005134_001

Figure 4.18

4.4.15

Y2 range (view from the target of the Y1 and Y2 leaves) in Bipolar coordinate system

Range of movement of diaphragms in the IEC 61217 coordinate system The illustrations in this topic are for the Agility™ beam limiting device (BLD) only. The same coordinate system applies to MLCi2™ with the corresponding ranges, see Default ranges of parameters in the IEC 61217 coordinate system for MLCi2™. All movements are continuously variable. All scales are in compliance with IEC 61217 standard. The beam rotates radially through 360° in the direction of the isocenter. The plane of rotation is perpendicular to the gantry axis. All data is nominal. The Y1 and Y2 parameters give the specified distance (cm) between the edge of the field and the isocenter. The Y1 and Y2 parameters are related. Gray areas show the maximum range of movement for each diaphragm or leaf.

005130_001

Figure 4.19

Y1 range (view from the target of the Y1 and Y2 diaphragms) in IEC 61217 coordinate system

Figure 4.20

Y2 range (view from the target of the Y1 and Y2 diaphragms) in IEC 61217 coordinate system

005133_001

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Technical description Scales and ranges

4.4.16

Range of movement of diaphragms in the IEC 60601-2-1 and Bipolar coordinate systems The illustrations in this topic are for the Agility™ beam limiting device (BLD) only. The same coordinate system applies to MLCi2™ with the corresponding ranges, see Default ranges of parameters in the IEC 61217 coordinate system for MLCi2™.

005138_001

Figure 4.21 system

X1 range (view from the target of the X1 and X2 parameters) in IEC 60601-2-1 coordinate

005137_001

Figure 4.22

X1 range (view from the target of the X1 and X2 parameters) in Bipolar coordinate system

Figure 4.23 system

X2 range (view from the target of the X1 and X2 parameters) in IEC 60601-2-1 coordinate

005141_001

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Technical description Shadow trays and electron applicators technical data

005140_001

Figure 4.24

X2 range (view from the target of the X1 and X2 parameters) in Bipolar coordinate system

4.5

Shadow trays and electron applicators technical data

4.5.1

Standard shadow tray assembly 2

1

4

3

5

6

7

10

5

9

8 NOT TO SCALE

Figure 4.25

(1)

Latch assembly

(2)

D-type connector

(3)

Removable acrylic tray

(4)

Hook

(5)

Handle

(6)

Release screws

(7)

Coded acrylic tray

(8)

Tray locking lever

(9)

Safety lock

(10)

T-handle

Document ID: 1531930_05

003268

©2012 Elekta Limited

Standard shadow tray parts

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Technical description Shadow trays and electron applicators technical data

1 003270

NOT TO SCALE

Figure 4.26

(1)

©2012 Elekta Limited

Standard shadow tray coding switches

Coding switches

10 mm

A 0

110 mm 10 mm

B 0

NOT TO SCALE

Figure 4.27

(A)

Distance to target

Table 4.22

000399

©2011 Elekta Limited

Standard shadow tray dimensions

(B)

Distance to isocenter

Standard shadow tray nominal weights and dimensions

Parameter

Weight or dimension

Total length (maximum)

450 mm

Total width (maximum)

382 mm

Total height (maximum)

185 mm

Weight of the shadow tray assembly (without shielding blocks)

6.7 kg

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Technical description Shadow trays and electron applicators technical data

Parameter

Weight or dimension

Maximum height of shielding blocks

100 mm with the two plates in position.

Maximum height of shielding blocks

119 mm without the inner tray in position.

Distributed load (maximum) at 0° and 180°

30 kg

Distributed load (maximum) at a different gantry angle

15 kg

A = Distance of the target to inner surface of the coded acrylic tray

672 mm

B = Distance of the isocenter to inner surface of 328 mm the coded acrylic tray

4.5.2

Short shadow tray assembly 1

2 3

10

10 mm 9

4

4

85 mm 10 mm

5

6

7

8 001737

Figure 4.28

©2011 Elekta Limited

Short shadow tray dimensions

(1)

Distance A to target

(2)

D-type connector

(3)

Latch assembly

(4)

Handle

(5)

Coded acrylic tray

(6)

Coding switches

(7)

Distance B to isocenter

(8)

Removable acrylic tray

(9)

Release screws

(10)

Hook

Table 4.23

Short shadow tray nominal weights and dimensions

Parameter

Weight or dimension

Total length (maximum)

450 mm

Total width (maximum)

382 mm

Total height (maximum)

160 mm

Weight of the shadow tray assembly (without shielding blocks)

6.7 kg

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Technical description Shadow trays and electron applicators technical data

Parameter

Weight or dimension

Maximum height of shielding blocks

75 mm with the two plates in position.

Maximum height of shielding blocks

94 mm without the inner tray in position.

Distributed load (maximum) at 0° and 180°

30 kg

Distributed load (maximum) at a different gantry angle

15 kg

A = Distance of target to the inner surface of the coded acrylic tray

647 mm

B = Distance of the isocenter to the inner surface of the coded acrylic tray

353 mm

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Technical description Shadow trays and electron applicators technical data

4.5.3

Electron applicators See Figure 4.29, Figure 4.30, and Figure 4.31, for a description of the square and rectangular electron applicators.

3 5 4 1 5 2

6

8

7 NOT TO SCALE

Figure 4.29

000169

©2011 Elekta Limited

Square and rectangular electron applicators

(1)

Coding switches

(2)

Touchguard switch (out of view)

(3)

Coded end frame

(4)

Touchguard

(5)

Clamping lever and clamp

(6)

Hook

(7)

Latch

(8)

T-handle

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Technical description Shadow trays and electron applicators technical data

1

5

2 4

3

NOT TO SCALE

Figure 4.30

003172

©2012 Elekta Limited

Square and rectangular electron applicators (view 1)

(1)

Touchguard

(2)

Clamping lever

(3)

T-handle

(4)

Touchguard switch (out of view)

(5)

Coded end frame

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Technical description Shadow trays and electron applicators technical data

1

4

2

3 NOT TO SCALE

Figure 4.31

003173

©2012 Elekta Limited

Square and rectangular electron applicators (view 2)

(1)

Clamping lever

(2)

Coding switches

(3)

Latch

(4)

Hook

See Figure 4.32 for a description of the circular electron applicators.

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Technical description Shadow trays and electron applicators technical data

2

3

1 4

5

6

8 9

7

000683_001

Figure 4.32

Circular electron applicators

(1)

End tube retaining-spring

(2)

End tube

(3)

Keyways

(4)

Keys

(5)

Selecting ring

(6)

Index mark

(7)

Hook

(8)

Latch

(9)

T-handle

See Figure 4.33 and Figure 4.34 for a description of the HDRE applicator.

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Technical description Shadow trays and electron applicators technical data

1

Figure 4.33

(1)

T-handle

003169

©2012 Elekta Limited

(2)

NOT TO SCALE

003171

©2012 Elekta Limited

Handle

1

Figure 4.34

Document ID: 1531930_05

NOT TO SCALE

HDRE applicator (view 1)

2

(1)

2

Hook

HDRE applicator (view 2)

(2)

Latch

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Technical description Shadow trays and electron applicators technical data

4.5.4

Weights and dimensions of the square and rectangular electron applicators Table 4.24

Weights and dimensions of the square and rectangular electron applicators

Description

4.5.5

Dimension/weight (kg)

Total length (maximum)

390 mm

Total width (maximum)

250 mm

Total height (maximum)

440 mm

Weight (without the end frame)

7.0 kg (6 × 6 cm) to 13.2 kg (25 × 25 cm)

Maximum field size

25 × 25 cm

Target to end frame distance

95 ±0.5 cm

Target to end frame distance for the short SSD electron applicator

82 ±0.5 cm

Maximum field shape (with special end frames if necessary)

25 × 25 cm

Weights and dimensions of the circular electron applicator Table 4.25

Weights and dimensions of the circular electron applicator

Description

4.5.6

Dimension/weight (kg)

Total length (maximum)

390 mm

Total width (maximum)

250 mm

Total height (maximum) with an end tube installed

438 mm

Total height (maximum) without an end tube installed

337 mm

Weight (with a 5 cm end tube)

6.2 kg

Field sizes (inner diameter)

2 cm, 3 cm, 4 cm, and 5 cm

Maximum height of the shielding blocks with the acrylic tray removed

94 mm

Shadow tray parameter The shadow tray assembly attaches to the BLD. The valid range of codes is from 0 to 127. Table 4.26

Values of the shadow tray parameter

Shadow tray number

Description

0

No shadow tray attached.

1 to 126

Coded acrylic tray attached.

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Technical description Shadow trays and electron applicators technical data

Shadow tray number

4.5.7

Description

127

Shadow tray attached, but no coded acrylic tray installed.

128

Coded acrylic tray attached incorrectly.

Description of the identification codes for coded acrylic trays An acrylic tray must have an identification code. The code is a maximum of seven holes, made with a drill in a special sequence, on the side of the acrylic tray. The valid range is 0 to 126. Acrylic trays can be made in-house. Coded acrylic trays, and acrylic trays without identification codes, are available from Elekta. Code No.

Drilling reference A B C D E F G

Code No.

Drilling reference A B C D E F G

Code No.

Drilling reference A B C D E F G

0

+ + + + + + +

43

0 0 + 0 + 0 +

86

+ 0 0 + 0 + 0

1

0 + + + + + +

44

+ + 0 0 + 0 +

87

0 0 0 + 0 + 0

2

+ 0 + + + + +

45

0 + 0 0 + 0 +

88

+ + + 0 0 + 0

3

0 0 + + + + +

46

+ 0 0 0 + 0 +

89

0 + + 0 0 + 0

4

+ + 0 + + + +

47

0 0 0 0 + 0 +

90

+ 0 + 0 0 + 0

5

0 + 0 + + + +

48

+ + + + 0 0 +

91

0 0 + 0 0 + 0

6

+ 0 0 + + + +

49

0 + + + 0 0 +

92

+ + 0 0 0 + 0

7

0 0 0 + + + +

50

+ 0 + + 0 0 +

93

0 + 0 0 0 + 0

8

+ + + 0 + + +

51

0 0 + + 0 0 +

94

+ 0 0 0 0 + 0

9

0 + + 0 + + +

52

+ + 0 + 0 0 +

95

0 0 0 0 0 + 0

10

+ 0 + 0 + + +

53

0 + 0 + 0 0 +

96

+ + + + + 0 0

11

0 0 + 0 + + +

54

+ 0 0 + 0 0 +

97

0 + + + + 0 0

12

+ + 0 0 + + +

55

0 0 0 + 0 0 +

98

+ 0 + + + 0 0

13

0 + 0 0 + + +

56

+ + + 0 0 0 +

99

0 0 + + + 0 0

14

0 0 0 + + +

57

0 + + 0 0 0 +

100

+ + 0 + + 0 0

15

0 0 0 0 + + +

58

+ 0 + 0 0 0 +

101

0 + 0 + + 0 0

16

+ + + + 0 + +

59

0 0 + 0 0 0 +

102

+ 0 0 + + 0 0

17

0 + + + 0 + +

60

+ + 0 0 0 0 +

103

0 0 0 + + 0 0

18

+ 0 + + 0 + +

61

0 + 0 0 0 0 +

104

+ + + 0 + 0 0

19

0 0 + + 0 + +

62

+ 0 0 0 0 0 +

105

0 + + 0 + 0 0

20

+ + 0 + 0 + +

63

0 0 0 0 0 0 +

106

+ 0 + 0 + 0 0

21

0 + 0 + 0 + +

64

+ + + + + + 0

107

0 0 + 0 + 0 0

22

+ 0 0 + 0 + +

65

0 + + + + + 0

108

+ + 0 0 + 0 0

23

0 0 0 + 0 + +

66

+ 0 + + + + 0

109

0 + 0 0 + 0 0

24

+ + + 0 0 + +

67

0 0 + + + + 0

110

+ 0 0 0 + 0 0

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Technical description Shadow trays and electron applicators technical data

Code No.

Drilling reference

Code No.

A B C D E F G

Drilling reference A B C D E F G

Code No.

Drilling reference A B C D E F G

25

0 + + 0 0 + +

68

+ + 0 + + + 0

111

0 0 0 0 + 0 0

26

+ 0 + 0 0 + +

69

0 + 0 + + + 0

112

+ + + + 0 0 0

27

0 0 + 0 0 + +

70

+ 0 0 + + + 0

113

0 + + + 0 0 0

28

+ + 0 0 0 + +

71

0 0 0 + + + 0

114

+ 0 + + 0 0 0

29

0 + 0 0 0 + +

72

+ + + 0 + + 0

115

0 0 + + 0 0 0

30

+ 0 0 0 0 + +

73

0 + + 0 + + 0

116

+ + 0 + 0 0 0

31

0 0 0 0 0 + +

74

+ 0 + 0 + + 0

117

0 + 0 + 0 0 0

32

+ + + + + 0 +

75

0 0 + 0 + + 0

118

+ 0 0 + 0 0 0

33

0 + + + + 0 +

76

+ + 0 0 + + 0

119

0 0 0 + 0 0 0

34

+ 0 + + + 0 +

77

0 + 0 0 + + 0

120

+ + + 0 0 0 0

35

0 0 + + + 0 +

78

+ 0 0 0 + + 0

121

0 + + 0 0 0 0

36

+ + 0 + + 0 +

79

0 0 0 0 + + 0

122

+ 0 + 0 0 0 0

37

0 + 0 + + 0 +

80

+ + + + 0 + 0

123

0 0 + 0 0 0 0

38

+ 0 0 + + 0 +

81

0 + + + 0 + 0

124

+ + 0 0 0 0 0

39

0 0 0 + + 0 +

82

+ 0 + + 0 + 0

125

0 + 0 0 0 0 0

40

+ + + 0 + 0 +

83

0 0 + + 0 + 0

126

+ 0 0 0 0 0 0

41

0 + + 0 + 0 +

84

+ + 0 + 0 + 0

127

0 0 0 0 0 0 0

42

+ 0 + 0 + 0 +

85

0 + 0 + 0 + 0

Key:

4.5.8

+

undrilled (switch pressed)

0

drilled (switch not pressed)

Description of the auto field correction The Integrity™ system can be configured to use Aktina cones. To enable the Aktina cones auto field correction rule, make sure that the Aktina Cones is selected in the Linac Options tab of the Configuration Utility window (see Figure 4.35).

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Technical description Radiation data

017122_001

Figure 4.35

Linac Options window

Aktina cones are small field circular collimators in a range of 4 mm to 40 mm field size, with increments of 1 mm. The accessory ID of the cone is equal to the size of the aperture of the cone in centimeters. If the Aktina cones auto field correction rule is enabled and the prescription from R&V system has the accessory ID from 4 to 40, the prescribed field size is validated when you load the field. The system will make sure that the positions of the diaphragms and leaves are updated to the maximum field size of 6 cm x 6 cm at the center.

4.6

Radiation data

4.6.1

Description of the radiation data for the linear accelerator The radiation data parameters are used to control the radiation performance of the linear accelerator. The parameters are: •

Energy

•

Physical motorized wedge

•

Prescribed MU (segment MU and delivery MU)

•

Backup MU

•

Dose rate

•

Beam timer.

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Technical description Radiation data

4.6.2

Energy parameter The energy parameter gives the energy of the radiation beam that the linear accelerator delivers. The valid range, related to the radiation and linear accelerator types, is: •

•

X-ray nominal values: –

1 to 3 energies from 4, 6, 8, 10, 15, 18, and 25 MV, and also

–

0 to 2 energies from 6 MV FFF, and 10 MV FFF. (Agility™ only).

Electron nominal values: –

For Agility, 0 to 8 energies from 4, 6, 8, 9, 10, 12, 15, 18, and 20 MeV.

–

For MLCi2, 0 to 9 energies from 4, 6, 8, 9, 10, 12, 15, 18, 20 and 22 MeV.

Note:

If you select an FFF energy parameter, you cannot use 18 MeV and 20 MeV.

Note:

A machine cannot be set up with 9 MeV and 10 MeV together, only 9 MeV or 10 MeV.

4.6.3

Description of the physical motorized wedge parameter This parameter gives the position of the wedge. The wedge is IN or OUT of the path of the delivered radiation beam. The wedge IN parameter limits the maximum field size and the range of movement of the diaphragms in the wedged direction. For example (IEC 61217), if the wedge is IN:

Note:

4.6.4

•

Maximum Diaphragm Y1 and Y2 = 15.0 cm.

•

Maximum Field size Y = 30.0 cm.

The maximum field size is 40 cm (20 cm for each diaphragm) in the direction not wedged.

Technical description of the prescribed MU parameter The prescribed MU parameter gives the number of monitor units of radiation to deliver. The applicable range is: •

1.0 to 1000.0 for each segment.

•

0.0 for non-radiating segments.

Prescribed MU is related to gantry movement through the total number of degrees in the arc. The prescribed MU must be more than 0.1 MU for each 1°. For 6 MV FFF this limit is 0.2 MU for each 1° and for 10 MV FFF this limit is 0.4 MU for each 1°. For example, for an Arc template (IEC 61217), if the total arc is 30.0°, then the minimum prescribed MU is 3 MU. The Segment MU shows the Set and Actual values of Prescribed MU for the current irradiating segment. This only shows on the Monitor Field Delivery window during a dynamic treatment technique. Note:

For FFF energies, specially 10 MV FFF, in some conditions the total dose delivered can be a maximum of 0.3 MU more than the prescribed MU.

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Technical description Radiation data

The Delivery MU value is derived at the time of beam delivery. The Segment MU of a sequence of segments is added. The maximum is 29980. The Delivery MU value is derived until one of these conditions, or changes, occur: •

The ratio of the dose or arc rate changes, and the PreciseBEAM™ VMAT license is not valid.

•

The direction of movement of the gantry or BLD changes (between clockwise, counterclockwise, and stopped).

•

A linear accelerator movement is set with a prescribed value of 0 MU.

•

The wedge position.

•

The energy.

•

The Delivery MU value gets to 29980 MU.

•

The remaining beam MU is less than 1 MU.

The Linac record records the derived Delivery segment as one delivered irradiating segment.

4.6.5

Technical description of the backup MU parameter The backup MU is related to the prescribed MU value. This value must be between 2 MU and 10 MU more than the prescribed MU value. An abnormal termination of the radiation will occur if the radiation does not stop at the prescribed MU value and reaches the value defined for the backup MU. The applicable range is:

4.6.6

•

3.0 to 1010.0 MU for each segment

•

0.0 for a non-radiating segment.

Description and operation of the dose rate parameter This is a description of the operation of the dose rate parameter, and how Integrity™ calculates the delivery dose rate for different treatment techniques. The dose rate parameter is part of the radiation data set for the linear accelerator. The dose rate parameter identifies the number of MU delivered for each minute during radiation, at the isocenter in usual conditions. Integrity™ calculates the optimum dose rate. But, you can select a lower dose rate to override (put a top limit on) the optimum dose rate if it is necessary. For each segment in a field, Integrity calculates the optimum dose rate to use. This section gives information on the algorithm that Integrity uses to calculate the optimum dose rate. For more information, contact Elekta Care. For dynamic fields, the algorithm optimization of the prescribed dose rate gives the best possible dose rate for the treatment. The optimization uses the parameters from the gantry, collimator, diaphragm, and leaf speed of the linear accelerator. Optimization of static fields is not necessary. See Table 4.27 to see how Integrity calculates the dose rate for each segment. Table 4.27

Dose rate for each segment

Optimum Dose Rate

=

Segment Dose / Minimum Segment Time

Where: Minimum Segment Time is the maximum of: Minimum Dose Time Document ID: 1531930_05

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Technical description Radiation data

Minimum Gantry Time Minimum Diaphragm Travel Time Minimum Collimator Rotation Time Minimum Leaf Time Where: Minimum Dose Time = Segment Dose / Maximum Available Dose Rate Minimum Gantry time = Gantry Movement / Maximum Gantry Velocity Minimum Diaphragm Travel Time = Diaphragm Travel / Maximum Diaphragm Velocity Minimum Collimator Rotation Time = Collimator Rotation / Maximum Diaphragm Angular Velocity For each leaf: Minimum Leaf Time = Leaf Travel / Maximum Leaf Velocity You can select a dose rate that will override (put a top limit on) the calculated dose rate. The delivery dose rate is the highest available dose rate that is not more than the: •

Optimum dose rate, or

•

User dose rate.

Two modes of dose rate delivery are available, CVDR and SDR. For Standard Arc, PreciseBEAM™ Dynamic, and PreciseBEAM™ VMAT fields, Integrity selects the CVDR mode, if it is not disabled. For all other treatments, Integrity™ selects the SDR mode. For CVDR, the delivery dose rate is a nominal value equal to the lowest value of the optimum dose rate or user dose rates (in a small tolerance). The tolerance is related to the maximum configured dose rate, which changes. You can calculate the available dose rates when you divide the maximum dose rate available a number of times by two. The system reads the maximum available dose rate from the Cal Block of the selected energy from Item 44 of Part 134 (see Table 4.28). Table 4.28

Available dose rates and PRF codes

Dose rate

PRF code Low energy

High energy

Maximum available dose rate

7

6

Maximum available dose rate/2

6

5

Maximum available dose rate/4

5

4

Maximum available dose rate/8

4

3

Maximum available dose rate/16

3

2

Maximum available dose rate/32

2

1

Maximum available dose rate/64

1

1

For SDR, the delivery dose rate is the available dose rate that is equal to or less than the optimum dose rate, or user dose rate if specified.

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Technical description Radiation data

The actual dose rate delivered is almost the same as the prescribed dose rate, but there are many causes which can make these values different. For example, the humidity and gantry angle can cause the difference. The actual dose rate is in a specified range of the prescribed dose rate. If the actual value is less than 75% or more than 125% of the prescribed value, then the dosimetry system terminates the treatment delivery. Integrity™ replaces the segment timer from earlier software releases with a beam timer. This parameter is the maximum time that you can deliver radiation continuously. The accurate setting of the energy nominal dose rate is necessary for the parameter to be correct. If the time to deliver the beam is at the maximum time for radiation delivery, an abnormal termination occurs. For dynamic treatment techniques, Integrity calculates the set time for each segment when it is loaded. Integrity uses the segment dose and the prescribed dose rate for that segment, which it adds to the previous set time total. This gives the total set time to the end of the current segment. Therefore, the total set time is updated many times during the treatment cycle. Related Links: Range of gantry rotation speed in relation to the dose rate in arc therapy mode on page 54

4.6.7

Example of the standard dose rate for a three control point, two segment, dynamic field for Agility™ This is a description of a calculated example for the standard dose rate, with a calculated PRF code and selected dose rate, for the linear accelerator. A three control point, two segment, dynamic field delivers 100 MU at 0°, and then 100 MU equally between 0° and 180° (see Table 4.29). Table 4.29

Control points for the example

Description

Note:

CP1

CP2

CP3

Dose (MU)

0

100

200

Gantry Angle (°)

0

0

180

All coordinates are in the Bipolar scale convention. The linear accelerator that delivers the field has a maximum gantry angular velocity of 6°/s. It has a maximum dose rate of 400 MU/min at a low energy.

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Technical description Radiation data

For the first segment, CP1 to CP2, no movement occurs. The dose will be delivered at the maximum available dose rate, which is: •

400 MU/min at PRF code 7.

For the second segment, CP2 to CP3, to get the minimum time necessary to deliver the dose, divide the segment dose by the maximum dose rate: •

100 MU / 400 MU/min = 0.25 min = 15 s.

To find the minimum time necessary to move the gantry, divide the gantry arc by the maximum gantry angular velocity: •

180° / 6°/s = 30 s.

The gantry will use more time to move than the dose will use to deliver. Therefore, the system must decrease the dose rate to deliver the dose smoothly through the arc. The optimum dose rate for this segment is therefore: •

100 MU / 0.5 min = 200 MU/min.

See Table 4.30 for the available dose rates for a low energy linear accelerator with a maximum dose rate of 400 MU. Table 4.30

Available dose rates and PRF codes

Dose rate

PRF code

400

7

200

6

100

5

50

4

25

3

12

2

6

1

The available dose rate which is equal to or less than the ideal dose rate is selected by Integrity. In the example, this is a dose rate of 200 MU/min at PRF code 6.

4.6.8

Example of the standard dose rate for a multi-segment field for Agility™ See Table 4.31 for the multi-segment field parameters. Table 4.31

Multi-segment field parameters

Parameter

CP1

CP2

Dose (MU)

0

30

Gantry Angle (°)

0

30

Diaphragm X1 position (cm)

6

20

Diaphragm X2 position (cm)

6

20

Diaphragm Y1 position (cm)

6

20

Diaphragm Y2 position (cm)

6

20

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Technical description Radiation data

Parameter

Note:

CP1

CP2

Collimator rotation (°)

0

180

Leaf travel Y1:1

-5

5

Leaf travel Y1:80

-4

20

Leaf travel Y2:1

5

6

Leaf travel Y2:80

-5

3

All coordinates are in the Bipolar scale convention. Leaves Y1:2 to Y1:79 are as Y1:1, and Y2:2 to Y2:79 are as Y2:1. Set the linear accelerator that is to deliver the field to a low energy. Set the parameters that follow to their maximum value: •

Dose rate of 400 MU/min

•

Gantry angular velocity of 6°/s

•

Collimator angular velocity of 18°/s

•

Maximum leaf velocity of 3.5 cm/s

•

Maximum dynamic leaf guide velocity of 3.0 cm/s.

For the first segment, CP1 to CP2: Minimum time to deliver dose

=

30 MU / 400 MU/min

=

0.075 min

Minimum time for gantry travel

=

30°/6°/s

=

5s

Minimum time for diaphragm travel

=

14 cm / 9 cm/s

=

1.6 s

Minimum time for = collimator rotation

180° / 18°/s

=

10 s

Minimum time for leaf travel

20 cm (Leaf Y1:80) / = 3.5 cm/s

5.7 s

4 cm / 3.0 cm/s

1.3 s

=

Minimum time for = dynamic leaf guide travel

=

=

4.5 s

The time to deliver the segment is 10 s. To deliver 30 MU at the same rate for 10 s, an optimum dose rate of 180 MU/min is necessary: 30/0.167 = 180 MU/min The delivery dose rate and PRF code are selected from the available dose rates for the linear accelerator. See Table 4.32 for the available dose rates for a low energy linear accelerator with a maximum available dose rate of 400 MU.

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Technical description Radiation data Table 4.32

4.6.9

Available dose rates

Dose rate

PRF code

400

7

200

6

100

5

50

4

25

3

12

2

6

1

Description and operation of the beam timer This is a description of the operation of the beam timer, which is part of the radiation data set for the linear accelerator. This parameter is the maximum time that you can deliver radiation continuously. The accurate setting of the energy nominal dose rate is necessary for the parameter to be correct. An abnormal termination will occur at the maximum time for radiation delivery.

Note:

The beam timer replaces the segment timer of earlier software releases. For dynamic treatment techniques, Integrity calculates the set time for each segment when it is loaded. The system uses the segment dose and the prescribed dose rate for that segment, which it adds to the previous set time total. This gives the total set time to the end of the current segment. For complex treatments, the total set time is updated many times during the treatment cycle. Integrity always calculates the set time. It is difficult to make an accurate estimate of the time necessary to deliver a beam. Therefore, do not change the set time. The ConvFactor is selected to give a set time 15% more than the estimate of the time necessary. Set Segment Time

= {Segment Dose(MU)/Expected Dose Rate(MU/min)} x ConvFactor

Total Set Time

= 0.1 min + sum (Set Segment Time for previous Segments) + Set Segment Time for current Segment

The Total Set Time is rounded to the nearest 0.1 min. This is an example of a calculated two segment beam. The first segment is 140 MU at 560 MU/ min, and the second segment is 210 MU. At 280 MU/min: Set Segment Time for segment 1 = (140 / 560) * 1.15

= 0.2875 min

Set Segment Time for segment 2 = (210 / 280) * 1.15

= 0.8625 min

Therefore: Total Set Time during segment 1

= 0.1 + 0.287

= 0.3875 min, that is rounded to 0.4 min.

Total Set Time during segment 2

= 0.1 + 0.2875 + 0.8625

= 1.25 min, that is rounded to 1.2 min.

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Technical description Environmental conditions

4.7

Environmental conditions

4.7.1

Environmental conditions for the EMLA system Except where other permitted conditions are stated, environmental conditions for locations where the linear accelerator and associated devices are installed, operated or stored without packaging are as follows: Table 4.33

Environmental conditions for operation and storage without packaging

Condition

Permitted conditions

Ambient temperature

+17 °C to +35 °C

Relative humidity

30% to 70%

Maximum change in humidity

20 % per hour

Atmospheric pressure

80 kPa to 101 kPa (800 mbar to 1010 mbar)

Maximum altitude for operation1

2000 m

1

For higher altitudes, contact your local Elekta representative.

Except where other permitted conditions are stated, environmental conditions where the linear accelerator is transported or stored with packaging are as follows: Table 4.34

Environmental conditions for transportation and storage with packaging

Condition

Note:

Permitted conditions

Ambient temperature

-10°C to +55°C (up to 30 days) 0°C to +55°C (more than 30 days)

Maximum change in temperature

4 °C per hour

Relative humidity

5% to 90%

Maximum change in humidity

20% per hour

Atmospheric pressure

50 kPa to 110 kPa (500 mbar to 1100 mbar)

Maximum vibration

2 g (5 Hz to 150 Hz)

Maximum shock

10 g (duration 6 ms to 16 ms)

Maximum time in storage

12 months (maximum life of silica gel)

All relative humidity specifications are non-condensing.

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Technical data for the treatment table

5

Technical data for the treatment table

Section

Title

Page

5.1

Technical data on the Precise Treatment Table™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

5.1.1

Description of the speed control for ASU movements . . . . . . . . . . . . . . . . . . . . . . . . . . 85

5.1.2

Description of the speed control for ASU movements (Elekta Harmony, Elekta Harmony Pro) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1.3

Specification of the electrical power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

5.2

Dimensions of the Precise Treatment Table™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

85

5.3

Dimensions of the treatment table for Elekta Harmony, Elekta Harmony Pro . . . . . . . .

87

5.4

Dimensions of the electrical interface module (EIM) cabinet . . . . . . . . . . . . . . . . . . . . 88

5.5

Dimensions of the uninterruptible power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

5.6

Range and accuracy data of the Precise Treatment Table™ . . . . . . . . . . . . . . . . . . . . .

5.6.1

Range and accuracy data for height movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

5.6.2

Range and accuracy data for lateral movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

5.6.3

Range and accuracy data for longitudinal movement . . . . . . . . . . . . . . . . . . . . . . . . . . 92

5.6.4

Range and accuracy data for column rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.6.5

Range and accuracy data for isocentric rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

5.7

Range of movements of the Precise Treatment Table™ . . . . . . . . . . . . . . . . . . . . . . . . 94

5.7.1

Range of vertical movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.7.2

Range of lateral movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

5.7.3

Range of longitudinal movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

5.7.4

Range of movement of the column rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.7.5

Range of movement of the isocentric floor rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

5.8

Distance of movement of the Precise Treatment Table™ . . . . . . . . . . . . . . . . . . . . . . . 96

5.8.1

Distance of the vertical movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

5.8.2

Distance of the lateral movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

97

5.8.3

Distance of the longitudinal movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

98

5.8.4

Distance of the column rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

5.8.5

Distance of the isocentric rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

5.9

Range and accuracy data of the treatment table for Elekta Harmony, Elekta Harmony Pro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

5.10

Distance of movement of the treatment table for Elekta Harmony, Elekta Harmony Pro 105

5.10.1

Distance of the vertical movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

5.10.2

Distance of the lateral movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

5.10.3

Distance of the longitudinal movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

5.10.4

Distance of the column rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Elekta Medical Linear Accelerator

85

90

93

94

95

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Technical data for the treatment table

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Technical data for the treatment table Technical data on the Precise Treatment Table™

5.1

Technical data on the Precise Treatment Table™

5.1.1

Description of the speed control for ASU movements During ASU, Integrity decreases the speed of ASU movements to a nominal 50% of the maximum speed. The system decreases the speed for:

5.1.2

•

Rotation, 5° before the defined stop angle.

•

Linear movements, 25 mm before the defined stop position.

Description of the speed control for ASU movements (Elekta Harmony, Elekta Harmony Pro) During ASU, Integrity decreases the speed of ASU movements to a nominal 50% of the maximum speed. The system decreases the speed of linear movements, 25 mm before the defined stop position.

5.1.3

Specification of the electrical power supply The list shows the specifications of the electrical power supply for the treatment table supplied from the UPS through a 10 A circuit breaker. Parameter

5.2

Value

Supply

230 V AC ±15%

Supply frequency

50 - 60 Hz

Current

< 10 A

Dimensions of the Precise Treatment Table™ Table 5.1

Dimensions of the treatment table

Dimension

Value (mm)

Length

1295

Width

643

Fully extended height 1

1686

Distance between the finished floor level and the iso-rotation base

8

1

The maximum range of movement is 1750 mm. If you extend the treatment table through the height of 1686 mm, limit switches operate and lock the table at its maximum limit.

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Technical data for the treatment table Dimensions of the Precise Treatment Table™

8 mm 1

1860 mm 645 mm

643 mm

2

1259 mm 1295 mm 001793_002

Figure 5.1

(1)

Dimensions of the treatment table

Distance between finished floor level and iso-rotation base (8 mm)

(2)

Iso-rotation base center

For the specifications of the treatment table tops, see the applicable documentation supplied with the equipment. See Table 5.2 for the weights of the primary parts. The nominal total maximum weight of the Precise Treatment Table™ is 1250 kg. Table 5.2

Weights of primary parts of Precise Treatment Table™

Item

Value (kg)

Iso-rotation base

360

X, Y and Z primary assembly

775

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Technical data for the treatment table Dimensions of the treatment table for Elekta Harmony, Elekta Harmony Pro

5.3

Dimensions of the treatment table for Elekta Harmony, Elekta Harmony Pro

11 mm

1640 mm

643 mm

1259 mm 2000 mm 0155_LBMS

Figure 5.2

Dimensions of the treatment table (Elekta Harmony, Elekta Harmony Pro)

Table 5.3

Dimensions of the treatment table (Elekta Harmony, Elekta Harmony Pro)

Item

Value (mm)

Table top

2000

Carriage assembly

1259

Width

643 1

1640

Distance between the surface of the bottom cover and the floor

11

Fully extended height

1

The maximum range of movement is 1640 mm. If you extend the treatment table through the height of 1647 mm, the limit switches operate and lock the table at its maximum limit.

For the specifications of the treatment table tops, see the applicable documentation supplied with the equipment. Table 5.4

Weights of the primary parts of the treatment table

Item

Value (kg)

X, Y, and Z primary assembly

683

Nominal total maximum weight

700

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Technical data for the treatment table Dimensions of the electrical interface module (EIM) cabinet

5.4

Dimensions of the electrical interface module (EIM) cabinet 540 mm

310 mm

680 mm

000599

Figure 5.3

Dimensions of the interface module cabinet (EIM) cabinet

Table 5.5

Dimensions of the interface module cabinet (EIM) cabinet

Item

5.5

©2012 Elekta Limited

Nominal value

Length

540 mm

Width

310 mm

Height

680 mm

Weight

63 kg

Dimensions of the uninterruptible power supply

218 mm

180 mm

476 mm 0027_LBMS

Figure 5.4

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Dimensions of the uninterruptible power supply (UPS)

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Technical data for the treatment table Dimensions of the uninterruptible power supply Table 5.6

Dimensions of the uninterruptible power supply (UPS)

Item

Nominal value (mm)

Length

476

Width

180

Height

218

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Technical data for the treatment table Range and accuracy data of the Precise Treatment Table™

5.6

Range and accuracy data of the Precise Treatment Table™

5.6.1

Range and accuracy data for height movement Table 5.7

Range and accuracy data for vertical movements of the treatment table

Range of movement

At least 1100 mm from the lowest position.

With iBEAM evo Couchtop

> 630 mm (from finished floor level) < 1730 mm

With Connexion

> 635 mm (from finished floor level) < 1735 mm

With HexaPOD evo RT Couchtop

> 760 mm (from finished floor level) < 1860 mm

Horizontal displacement for a vertical movement

< 2 mm in a 500 mm range

Speed range 1

The speed is continuously adjustable > 2 mm/s < 45 mm/s to 60 mm/s

Speed with battery power supply in operation 1 ³ 10 mm/s (in down direction only) 1

- The treatment table top installed and an equal weight distribution of 200 kg on the table top.

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Technical data for the treatment table Range and accuracy data of the Precise Treatment Table™

5.6.2

Range and accuracy data for lateral movement Table 5.8

Range and accuracy data for lateral movement

Lateral movement range

-250 mm (- 10 mm/ +5 mm 1) to +250 mm (+10 mm/-5 mm 2)

Speed range 3

The speed is continuously adjustable. > 2 mm/s < 45 mm/s to 60 mm/s

Force to override the motor drive3

> 70 N < 225 N

Force to override the brake3

> 250 N

Force to move the treatment table when the brake is off 3

< 50 N < 60 N for the last 100 mm

1

- Motorized movement to A at - 250 mm

2

- Motorized movement to B at + 250 mm

3

- The treatment table top installed and an equal weight distribution of 200 kg on the table top.

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Technical data for the treatment table Range and accuracy data of the Precise Treatment Table™

5.6.3

Range and accuracy data for longitudinal movement Table 5.9

Range and accuracy data for longitudinal movement

Longitudinal movement range

0 ±10 mm 1 to 1000 ±20 mm 2

Speed range 3

The speed is continuously adjustable. > 2 mm/s < 45 mm/s to 60 mm/s

Force to override the motor drive

3

> 70 N < 225 N

Force to override the brake

3

Force to move the treatment table when the brake is off 3

> 250 N < 50 N < 60 N for the last 100 mm

1

- Motorized movement to T at 0 mm

2

- Motorized movement to G at 1000 mm

3

- The treatment table top installed and an equal weight distribution of 200 kg on the table top.

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Technical data for the treatment table Range and accuracy data of the Precise Treatment Table™

5.6.4

Range and accuracy data for column rotation Table 5.10

Range and accuracy data for column rotation

Range of movement

±180°

Manual rotation

Column rotation is not a motorized movement. There is an adjustable zero degree indent mechanism 1

Force to overcome the indent mechanism1when the brake is off 2

> 90 Nm (9.2 kg measured at a distance of 1 m from the pivot point) < 130 Nm (13.2 kg measured at a distance of 1 m from the pivot point)

Force to override the brake 2

> 220 Nm (22.4 kg measured at a distance of 1 m from the pivot point)

Force to move the treatment table when the brake is off 2

< 70 Nm (7.1 kg measured at a distance of 1 m from the pivot point) < 90 Nm at the 0° indent position

5.6.5

1

- At the height of the isocenter

2

- The treatment table top installed and an equal weight distribution of 200 kg on the table top.

Range and accuracy data for isocentric rotation Table 5.11

Range and accuracy data for isocentric rotation

Range of movement

Motorized movement a minimum of ±96° Manual movement ±100°

Maximum displacement of the axis < 0.75 mm (radius) (for a ±90° rotation) of isocentric rotation of the treatment table from the isocenter1 Speed range2

The speed is continuously adjustable. > 0.3°/s < 6.0° ±1°/s

Force to override the motor drive2 > 60 Nm (6.1 kg measured at a distance of 1 m from the pivot point) < 225 Nm (22.9 kg measured at a distance of 1 m from the pivot point) Force to override the brake2

>= 220 Nm (22.4 kg measured at a distance of 1 m from the pivot point)

Force to move the treatment table < 70 Nm (7.1 kg measured at a distance of 1 m from the when the brake is off 2 pivot point)

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Technical data for the treatment table Range of movements of the Precise Treatment Table™

1

- At the height of the isocenter

2 - The treatment table top installed and an equal weight distribution of 200 kg equally on the top.

5.7

Range of movements of the Precise Treatment Table™

5.7.1

Range of vertical movement The unit of measurement in this illustration is centimeters which are the parameters or values in the software of the equipment. This value is displayed on the treatment room monitor during table movement and system calibration.

Note:

Different table tops can change the limits of vertical movement in clinical operation.

175.0 cm

65.0 cm

001777

Figure 5.5

5.7.2

©2013 Elekta Limited

Range of vertical movement for the treatment table

Range of lateral movement The unit of measurement in this illustration is centimeters which are the parameters or values in the software of the equipment. This value is displayed on the treatment room monitor during table movement and system calibration.

25.0 cm 25.0 cm

001775

Figure 5.6

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Range of lateral movement for the treatment table

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Technical data for the treatment table Range of movements of the Precise Treatment Table™

5.7.3

Range of longitudinal movement The unit of measurement in this illustration is centimeters which are the parameters or values in the software of the equipment. This value is displayed on the treatment room monitor during table movement and system calibration.

0

100.0 cm

50.0 cm

50.0 cm

001776

Figure 5.7

5.7.4

©2013 Elekta Limited

Range of longitudinal movement for the treatment table

Range of movement of the column rotation

180º

180º 001778

Figure 5.8

©2013 Elekta Limited

Range of movements of the column rotation for the treatment table

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Technical data for the treatment table Distance of movement of the Precise Treatment Table™

5.7.5

Range of movement of the isocentric floor rotation

100º

100º

001774

Figure 5.9

©2013 Elekta Limited

Range of movement of the isocentric floor rotation for the treatment table

5.8

Distance of movement of the Precise Treatment Table™

5.8.1

Distance of the vertical movement The unit of measurement in this illustration is centimeters which are the parameters or values in the software of the equipment. This value is displayed on the treatment room monitor during table movement and system calibration. The scale conventions measure the limits of the vertical movement from the isocentric plane.

Document ID: 1531930_05

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Technical data for the treatment table Distance of movement of the Precise Treatment Table™

+50.0 cm

IEC 61217 0.0 (Isocenter)

-60.0 cm

003153

Figure 5.10

©2013 Elekta Limited

Limits of vertical movement for the treatment table (IEC 61217)

950.0 cm

IEC 60601 0.0 or 1000.0 cm (Isocenter)

+60.0 cm

003154

Figure 5.11

©2013 Elekta Limited

Limits of vertical movement for the treatment table (IEC 60601)

-50.0 cm

Bipolar 0.0 (Isocenter)

+60.0 cm

003020

Figure 5.12

5.8.2

©2013 Elekta Limited

Limits of vertical movement for the treatment table (Bipolar)

Distance of the lateral movement The unit of measurement in this illustration is centimeters which are the parameters or values in the software of the equipment. This value is displayed on the treatment room monitor during table movement and system calibration. The scale conventions measure the limits of the lateral movement from the center line of the treatment table.

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Technical data for the treatment table Distance of movement of the Precise Treatment Table™

IEC 61217 -25 cm

0.0

+25 cm

Figure 5.13

003157

©2014 Elekta Limited

003159

©2014 Elekta Limited

003158

©2014 Elekta Limited

Limits of lateral movement for the treatment table (IEC 61217)

IEC 60601

75.0 cm 100.0 cm or 0.0 25.0 cm

Figure 5.14

Limits of lateral movement for the treatment table (IEC 60601)

Bipolar -25 cm

0.0

+25 cm

Figure 5.15

5.8.3

Limits of lateral movement for the treatment table (Bipolar)

Distance of the longitudinal movement The unit of measurement in this illustration is centimeters which are the parameters or values in the software of the equipment. This value is displayed on the treatment room monitor during table movement and system calibration.

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Technical data for the treatment table Distance of movement of the Precise Treatment Table™

The scale conventions measure the limits of the longitudinal movement from the gantry end of the treatment table to the isocenter.

0

100 cm

IEC 61217

003155

Figure 5.16

©2013 Elekta Limited

Limits of longitudinal movement for the treatment table (IEC 61217)

0

100 cm

IEC 60601

003156

Figure 5.17

©2013 Elekta Limited

Limits of longitudinal movement for the treatment table (IEC 60601)

0

100 cm

Bipolar

003022

Figure 5.18

5.8.4

©2013 Elekta Limited

Limits of longitudinal movement for the treatment table (Bipolar)

Distance of the column rotation The scale conventions measure the angular limits of the movement laterally from the isocenter.

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Technical data for the treatment table Distance of movement of the Precise Treatment Table™

IEC 61217

90º

180º

0º

270º 003151

Figure 5.19

©2013 Elekta Limited

Limits of movement of column rotation for the treatment table (IEC 61217)

IEC 60601

90º

180º

0º

270º 003152

Figure 5.20

©2013 Elekta Limited

Limits of movement of column rotation for the treatment table (IEC 60601)

Bipolar

+90º

±180º

0º

-90º 003023

Figure 5.21

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Limits of movement of column rotation for the treatment table (Bipolar)

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Technical data for the treatment table Distance of movement of the Precise Treatment Table™

5.8.5

Distance of the isocentric rotation The scale conventions measure the angular limits of the movement laterally from the isocenter.

260º

IEC 61217

100º 001795

Figure 5.22

©2013 Elekta Limited

Limits of movement for isocentric rotation (IEC 61217)

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Technical data for the treatment table Distance of movement of the Precise Treatment Table™

IEC 60601

100º

260º 001797

Figure 5.23

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Limits of movement for isocentric rotation (IEC 60601)

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Technical data for the treatment table Distance of movement of the Precise Treatment Table™

Bipolar

+100º

-100º 001796

Figure 5.24

©2013 Elekta Limited

Limits of movement for isocentric rotation (Bipolar)

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Technical data for the treatment table Range and accuracy data of the treatment table for Elekta Harmony, Elekta Harmony Pro

5.9

Range and accuracy data of the treatment table for Elekta Harmony, Elekta Harmony Pro The column rotation is not a motorized movement, and therefore the range and force measurements are for manual movements only. The column has an adjustable 0° indent mechanism. Table 5.12

Range and accuracy of the treatment table movements with the treatment table top installed

Direction of movement

Range of movement From

Accuracy To

Vertical motorized movement

540 mm (from the finished floor)

1640 mm

< 2 mm horizontal displacement for every 500 mm of movement

Lateral motorized movement

-250 mm (A-side)

+250 mm (B-side)

-10 mm (A-side) 5mm to +5 mm to +10 mm (B-side)

Longitudinal motorized 340 mm (T-end) movement (small bunker)

840 mm (G-end)

±10 mm (T-end) ±20 mm (G-end)

Longitudinal motorized 0 mm (T-end) movement (normal bunker)

1000 mm (G-end)

±10 mm (T-end) ±20 mm (G-end)

Manual rotation of the -180° column

+180°

0° to 0.5°

The force and speed were measured with an equal weight distribution of 250 kg on the treatment table top. Table 5.13

Speed ranges for the treatment table movements with the treatment table top installed

Operation

Speed

Range of speed in all directions (the speed is continuously adjustable)

From 2 mm/s to between 45 mm/s and 66 mm/s

Speed of vertical movement with the uninterruptible power supply (UPS) in operation

10 mm/s (downwards direction)

The force for the column rotation was measured at a distance of 1 m from the pivot point. Table 5.14 installed

Force measurements for the treatment table movements with the treatment table top

Direction of movement Lateral and longitudinal

Document ID: 1531930_05

Operation

Force

Force to override the motor drive

From 70 N to 225 N

Force to override the brake

> 250 N

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Technical data for the treatment table Distance of movement of the treatment table for Elekta Harmony, Elekta Harmony Pro

Column rotation

Force to move the treatment table when the brake is off

< 50 N < 60 N for the last 100 mm

Force, at the isocenter height, to move the treatment table out of the 0° indent when the brake is off

From 120 Nm to 180 Nm

Force to override the brake

> 220 Nm

Force to move the treatment table when it is not in the 0° indent and the brake is off

< 70 Nm

5.10

Distance of movement of the treatment table for Elekta Harmony, Elekta Harmony Pro

5.10.1

Distance of the vertical movement The unit of measurement in this illustration is centimeters which are the parameters or values in the software of the equipment. This value is displayed on the treatment room monitor during table movement and system calibration. The scale conventions measure the limits of the vertical movement from the isocentric plane.

+40.0 cm

IEC 61217 0.0 (Isocenter)

-70.0 cm 0199_LBMS

Figure 5.25

Limits of vertical movement for the treatment table (IEC 61217)

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Technical data for the treatment table Distance of movement of the treatment table for Elekta Harmony, Elekta Harmony Pro

960.0 cm

IEC 60601 0.0 or 1000.0 cm (Isocenter)

+70.0 cm 0200_LBMS

Figure 5.26

Limits of vertical movement for the treatment table (IEC 60601)

-40.0 cm

Bipolar 0.0 (Isocenter)

+70.0 cm 0201_LBMS

Figure 5.27

5.10.2

Limits of vertical movement for the treatment table (Bipolar)

Distance of the lateral movement The unit of measurement in this illustration is centimeters which are the parameters or values in the software of the equipment. This value is displayed on the treatment room monitor during table movement and system calibration. The scale conventions measure the limits of the lateral movement from the center line of the treatment table.

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Technical data for the treatment table Distance of movement of the treatment table for Elekta Harmony, Elekta Harmony Pro

IEC 61217

-25 cm

0.0

+25 cm

0202_LBMS

Figure 5.28

Limits of lateral movement for the treatment table (IEC 61217)

IEC 60601

75.0 cm

100.0 cm or 0.0

25.0 cm

0203_LBMS

Figure 5.29

Limits of lateral movement for the treatment table (IEC 60601)

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Technical data for the treatment table Distance of movement of the treatment table for Elekta Harmony, Elekta Harmony Pro

Bipolar

-25 cm

0.0

+25 cm

0204_LBMS

Figure 5.30

5.10.3

Limits of lateral movement for the treatment table (Bipolar)

Distance of the longitudinal movement The unit of measurement in this illustration is centimeters which are the parameters or values in the software of the equipment. This value is displayed on the treatment room monitor during table movement and system calibration. The scale conventions measure the limits of the longitudinal movement from the gantry end of the treatment table to the isocenter. There are two sizes for the treatment room together with the equipment room in the G-T direction: •

Small treatment rooms together with the equipment room are between 5300 mm and 5800 mm in the G-T direction.

•

Standard-size treatment rooms together with the equipment room are more than 5800 mm in the G-T direction.

The longitudinal movement limits for the treatment table are different for a small treatment room and a standard-size treatment room. See Figure 5.31, Figure 5.32 and Figure 5.33 for the longitudinal movement limits for the treatment table in a standard-size treatment room.

IEC 61217

0

100 cm

0205_LBMS

Figure 5.31 (IEC 61217)

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Limits of longitudinal movement for the treatment table in a standard-size treatment room

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Technical data for the treatment table Distance of movement of the treatment table for Elekta Harmony, Elekta Harmony Pro

IEC 60601

0

100 cm

0206_LBMS

Figure 5.32 (IEC 60601)

Limits of longitudinal movement for the treatment table in a standard-size treatment room

Bipolar

0

100 cm

0207_LBMS

Figure 5.33 (Bipolar)

Limits of longitudinal movement for the treatment table in a standard-size treatment room

See Figure 5.34, Figure 5.35 and Figure 5.36 for the longitudinal movement limits for the treatment table in a small treatment room.

IEC 61217

34 cm

84 cm

0211_LBMS

Figure 5.34 61217)

Limits of longitudinal movement for the treatment table in a small treatment room (IEC

IEC 60601

34 cm

84 cm

0212_LBMS

Figure 5.35 60601)

Limits of longitudinal movement for the treatment table in a small treatment room (IEC

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Technical data for the treatment table Distance of movement of the treatment table for Elekta Harmony, Elekta Harmony Pro

34 cm

Bipolar

84 cm

0213_LBMS

Figure 5.36

5.10.4

Limits of longitudinal movement for the treatment table in a small treatment room (Bipolar)

Distance of the column rotation The scale conventions measure the angular limits of the movement laterally from the isocenter.

90º

IEC 61217

180º

0º

270º 0208_LBMS

Figure 5.37

Limits of movement of column rotation for the treatment table (IEC 61217)

90º

IEC 60601

180º

0º

270º 0209_LBMS

Figure 5.38

Limits of movement of column rotation for the treatment table (IEC 60601)

+90º

Bipolar

±180º

0º

-90º 0210_LBMS

Figure 5.39

Document ID: 1531930_05

Limits of movement of column rotation for the treatment table (Bipolar)

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