Standards related to:

YY 0775-2010**YY 0775-2010: PDF in English **

YY 0775-2010

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PHARMACEUTICAL INDUSTRY STANDARD

OF THE PEOPLE’S REPUBLIC OF CHINA

ICS 11.040.60

C 43

Teleradiotherapy treatment planning system accuracy

of dosimetric calculation and test methods for high

energy X (γ) beam

远距离放射治疗计划系统

ISSUED ON. DECEMBER 27, 2010

IMPLEMENTED ON. JUNE 1, 2012

Issued by. China Food and Drug Administration

Table of Contents

Foreword ... 3

1 Scope ... 4

2 Normative references ... 4

3 Terms and definitions ... 4

4 Requirements ... 5

4.1 Simple geometric conditions ... 5

4.2 Complex geometric conditions ... 5

4.3 Combination of complex geometric conditions ... 5

4.4 The outer edge of radiation field ... 6

4.5 The outer edge of radiation field, complex geometric conditions and the

central axis is blocked ... 6

5 Test methods ... 6

5.1 General test conditions ... 6

5.2 Test example... 9

5.3 Simple geometric conditions ... 9

5.4 Complex geometric conditions ... 9

5.5 Combination of complex geometric conditions ... 10

5.6 The outer edge of radiation field ... 10

5.7 The outer edge of radiation field, complex geometric conditions and the

central axis is blocked ... 10

Appendix A ... 11

Appendix B ... 12

References ... 23

Foreword

All technical content of this Standard is mandatory.

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

The test data and examples in this Standard adopt the test data (machine

configuration data) and examples in IAEA No.1540 Technical Report.

Please note that some of the content of this document may involve patents; the

issuing agency of this document does not undertake the responsibility for the

identification of these patents.

This Standard was proposed by and shall be under the jurisdiction of Sub-

committee on Radiotherapy, Nuclear medicine and Radiation Dosimetry

Equipment of National Technical Committee on Medical Electrical Equipment of

Standardization Administration of China (SAC/TC 10/SC 3).

Drafting organizations of this Standard. Beijing Institute for Medical Device

Quality Supervision and Testing of State Food and Drug Administration.

Main drafters of this Standard. Zhang Xin, Zhang Zhaoyuan, Yan Xu, Hu Jia

and Qing Hou.

Teleradiotherapy treatment planning system accuracy

of dosimetric calculation and test methods for high

energy X (γ) beam

1 Scope

This Standard specifies the accuracy of dosimetric calculation and test methods

of Radiotherapy Treatment Planning Systems (hereinafter referred to as RTPS).

This Standard applies to RTPS with dosimetric calculation and display function

of high energy X rays (4 MV ~ 25 MV), 60Co γ rays remote radiotherapy

treatment on photon radiation.

This Standard does not apply to the radiation treatment planning systems that

are used by stereotactic radiotherapy, intensity modulated radiation therapy

(IMRT) or other specialized radiotherapy techniques. However, the developers

are encouraged to use this Standard in development, and use as reference

standard in verifying dosimetric calculation algorithm.

Test packets in this Standard cannot be used for clinical treatment planning.

2 Normative references

The following referenced documents are indispensable for the application of

this document. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any

amendments) applies.

GB/T 17857-1999 Medical radiology - Terminology (Equipment for

radiotherapy, nuclear medicine and radiation dosimetry)

GB/T 18987-2003 Radiotherapy equipment - Coordinates, movements and

scales

3 Terms and definitions

The terms and definitions defined by GB/T 17857-1999 and the following ones

apply to this document.

The test requires to calculate point dose of a series of positions in a cube water

body model. Users are recommended to specify a cube water body model of

which the side length is 40 cm for RTPS, before test. Most RTSP allows to

determine the dose measurement points by inputting coordinate values.

However, if RTPS do not have the aforementioned functions, an easy way is to

use beam’s central axis, off-axis distance (1cm, 2cm, 2.5cm, 3cm, 5cm, 6cm,

7cm, 9cm and 19cm) and calculation depth (dmax, 1cm, 3cm, 5cm, 10cm, 11cm,

15cm, 20cm, 25cm, 30cm and 35cm) to represent for each measurement point.

Each test example has specified the aforementioned off-axis distance and

depth.

For each test example, the operator shall place radiation beam at the position

stipulated in the test example; and mark the calculation point of depth and off-

axis distance required by test. It shall use a great enough radiation beam

weighting to ensure that calculation result has enough accuracy, i.e., not using

too small weighting may be because of that the rounding or data truncation

causes the accuracy of calculation result less than 1%.

5.1.3 Beam dose setting

In some RPTS, beam dose setting is corresponding to the dose when beam is

transferred to dmax. While in some other systems, beam dose setting is

corresponding to the dose when beam is transferred to reference radiation field

size (i.e., 10 cm × 10 cm). Some other systems use different setting ways to set

beam dose. Users shall be familiar with beam dose setting ways and ensure

that calculation result is consistent to the conditions of obtaining corresponding

test data.

5.1.4 Coordinate system

In order to more-clearly express the geometric relationship between beam data

and test examples, the following coordinate system is stipulated related to water

body model. Water body model’s coordinate system is consistent to the fixed

coordinate system stipulated in GB/T 18987-2003.

Coordinate origin is at the isocenter of therapy equipment. Except isocenter test

example (test example 3); isocenter of other test examples all locates at the

surface of water body model.

Z-axis is perpendicular to the upper surface and points upward from the surface.

Z-axis coincides with the central axis of the radiation beam and points to

radiation source. Oblique incidence test example is excluded.

5.5 Combination of complex geometric conditions

Test shall conduct test example 12; calculate error according to formula (1).

Test results shall comply with requirements of 4.3.

5.6 The outer edge of radiation field

Test on measurement point of the outer edge of radiation field shall conduct test

example 1, 2, 3, 6; calculate error according to formula (2).

Where,

δ2 - Normalized relative error of measurement point of the outer edge of

radiation field, %;

Dc - Calculated values;

Dr - Reference values;

Da - Reference values of same depth on radiation beam.

Test results shall comply with requirements of 4.4.

5.7 The outer edge of radiation field, complex geometric conditions and

the central axis is blocked

Test on central beam measurement point of the outer edge of radiation field

under complex geometric conditions and the central axis is blocked shall

conduct test example 5, 7; calculate error according to formula (3).

Where,

δ3 - Normalized relative error of the outer edge of radiation field, complex

geometric conditions and the central axis is blocked, %;

Dc - Calculated values;

Dr - Reference values;

Do - Reference values of same depth in open field.

Test results shall comply with requirements of 4.5.

Appendix A

(Normative)

Test data

This Standard introduces data package in IAEA No.1540 Technical Report [1] as

predefined test conditions and test data of this Standard. The data package is

divided into four parts, respectively including input data and test results of 6 MV,

10 MV, 18 MV and 60Co γ. When using data package, it shall select suitable

data sets, input data by combining corresponding RTPS requirements, select

appropriate radiation beam model, build up test’s geometric conditions,

calculate dose of measurement point and input calculated values into

evaluation table for error calculation.

Test data package includes the following four parts.

- IAEApack06MV NCS data package for 6 MV X;

- IAEApack10MV NCS data package for 10 MV X;

- IAEApack18MV NCS data package for ...

......

Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.