WS 674-2020 in English
VALIDSpecification for testing of quality control in medical linear accelerator
- Issued on:2020-04-03
- Implemented on:2020-10-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
$520.00
$505.00
$505.00
Introduction
Analysis of the core content of the standard
This standard replaces part of GBZ 126-2011. The main technical changes include: adding quality control test methods (Chapters 5-6), revising the test cycle (Appendix C), adding isocenter verification specifications and other 9 substantive modifications. It is applicable to the quality management of medical electron linear accelerators throughout their life cycle.
Comparison of key test indicators
| Test items | Acceptance criteria | Stability cycle |
|---|---|---|
| Dose deviation | ≤3% | Weekly |
| Radiation field symmetry | ≤103% | 6 months |
| Isocenter shift | ≤2mm | Monthly |
Technology evolution analysis
Compared with the 2011 version, this standard strengthens:
- Neutron protection requirements when the electron beam energy exceeds 10MeV (4.3.3)
- Dose linearity control in dynamic treatment mode (6.1.3)
- treatment bed stiffness index required for three-dimensional conformal radiotherapy (≤5mm)
Implementation recommendations
Medical institutions should focus on:
- Acceptance testing must include stray radiation measurement as specified in Appendix A
- Status testing should be conducted once a year, using the phantom layout specified in Appendix D
- Dose repeatability in stability testing must reach ≤0.5%
Sample only — not a preview of WS 674-2020
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