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Teleradiotherapy treatment planning system accuracy of dosimetric calculation and test methods for high energy X(γ) beam
 
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YY 07752010: PDF in English YY 07752010
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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 1.12009.
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 178571999 Medical radiology  Terminology (Equipment for
radiotherapy, nuclear medicine and radiation dosimetry)
GB/T 189872003 Radiotherapy equipment  Coordinates, movements and
scales
3 Terms and definitions
The terms and definitions defined by GB/T 178571999 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, offaxis 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 offaxis 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 moreclearly 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 189872003.
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.
Zaxis is perpendicular to the upper surface and points upward from the surface.
Zaxis 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.
