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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 0775-2010: Teleradiotherapy treatment planning system accuracy of dosimetric calculation and test methods for high energy X(γ) beam
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/YY0775-2010
PHARMACEUTICAL INDUSTRY STANDARD
ICS 11.040.60
C 43
Teleradiotherapy treatment planning system accuracy
of dosimetric calculation and test methods for high
energy X (γ) beam
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.
3.1 dose calculated values (calculated values)
Absorbed dose values of measurement points of RTPS, calculated under
predetermined conditions.
4 Requirements
4.1 Simple geometric conditions
For each dosimetric calculation algorithm used, under simple geometric
conditions (square or rectangular radiation field, uniform body model, vertical
irradiation, etc.).
4.2 Complex geometric conditions
For each dosimetric calculation algorithm used, under complex geometric
conditions (wedge field, uneven body model, irregular field, asymmetric
collimator settings, etc.).
4.3 Combination of complex geometric conditions
For each dosimetric calculation algorithm used, under combination of complex
geometric conditions.
4.4 The outer edge of radiation field
For each dosimetric calculation algorithm used, under simple geometric
conditions, in test example 1, 2, 3, 6, the allowable error between RTPS’s
calculated values and reference values at the measurement points of the outer
edge of radiation field is ± 3%.
4.5 The outer edge of radiation field, complex geometric conditions and
the central axis is blocked
For each dosimetric calculation algorithm used.
5 Test methods
5.1 General test conditions
5.1.1 Test data
This Standard uses the test data stated in Appendix A as a RTPS test data
package (see Appendix A). This data package is for four different ray quality,
including the corresponding input data sets as well as a series of tests.
5.1.2 Material and position of body model
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.
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.
5.2 Test example
Description of test example is shown in Appendix B.
Test list of dosimetric calculation accuracy that shall be conducted during type
test and site inspection is shown in Table 1.
5.3 Simple geometric conditions
Test example conducted under simple geometric conditions and error
calculation method are as bellow.
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).
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).
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.
Appendix B
(Normative)
Test example
B.1 Summary
This appendix describes all the test examples in detail. Horizontal direction of
Figure B.1 ~ Figure B.17 is X direction; longitudinal direction is Z direction;
numerical value is cm. Unless otherwise indicated, the nominal SSD of all the
test examples to high energy photon beam of linear accelerator is 100 cm; to
60Co γ, it is 80 cm.
B.2 Test example 1a 5 cm × 5 cm open field
Use a cube water model of which side length is 40 cm to create a 5 cm × 5 cm
square field. Make beam central axis perpendicular to upper surface of cube
water model. Place it at the center of upper surface, i.e., equipment frame’s
angle is 0°, and align to Z axis of model. For easy positioning of calculation
point, beam central axis shall aim to the reference mark determined when
creating water model. Set a suitable weighting and ensure there is no any beam
dresser (wedge plate, tray, etc.) on beam path. Calculate dose distribution.
Record the dose at 1 cm, 3 cm, 5 cm, 10 cm, 15 cm, 20 cm, 25 cm and 35 cm
on the central axis. Compare calculation data and reference data.
It is necessary to calculate the dose at the point of which the off-axis distance
is 1 cm. Setting this off-axis distance is to plane the calculation point at the
approximate intermediate position between radiation field central axis and
radiation field edge. All the calculation points shall be placed at off-axis distance
= 1 cm. Divergent rays shall not be considered.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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