Output dose investigation and analysis of external beam radiotherapy in Beijing
10.13491/j.issn.1004-714X.2021.02.001
- VernacularTitle:北京地方所属外照射放射治疗设备输出剂量调查分析
- Author:
Zechen FENG
1
;
Yongzhong MA
1
;
Hongfang WANG
1
;
Yaru SUN
1
;
Zhibin ZHANG
1
;
Yun LOU
1
Author Information
1. Beijing Center for Disease Control and Prevention, Beijing Preventive Medicine Research Center
- Publication Type:Journal Article
- Keywords:
External Beam Radiotherapy;
Output Dose;
Quality Control
- From:
Chinese Journal of Radiological Health
2021;30(2):123-128
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To study the output dose of external beam radiotherapy in Beijing and analyze the cause of output
dose deviation. Guidance is given on the selection of measurement methods, calculation formulas and parameters.
Methods:During 2020, the output doses of medical electron accelerators, tomotherapy, cyberknife, and γ-knife were meas-
ured based on the water absorbed dose calibration factor combined with the requirements in the IAEA TRS398 and TRS483
reports, and low-energy X-rays were measured based on the air kerma calibration factor combined with the requirements in
the AAPM protocal. The output dose was measured and compared with the preset irradiation value.
Results :A total of
59 external beam radiation therapy equipments’s output dose were investigated.2 of the 49 accelerators’s absolute value of
relative deviation between the system indication value and the measurement exceeded 3%; the deviation of other external beam radiotherapy equipments was less than 3%.
Conclusion :A unified method and multi-party quality control can ensure
the accuracy of the output dose. In the routine operation of the equipment, the hospital should strictly implement periodic inspections to ensure accurate and reliable radiotherapy.
