Study on the calibration for the outputs of photon and electron beams of dual-mode of linear accelerator based on IAEA 277 and 381 reports
10.3969/j.issn.1672-8270.2024.01.006
- VernacularTitle:基于国际原子能机构277和381报告对直线加速器双模式光子线和电子线输出量校准研究
- Author:
Zhou JING
1
;
Youfen CHEN
;
Hang CHENG
;
Jiabin CAI
;
Lei ZHANG
;
Dehua KANG
Author Information
1. 余姚市人民医院放疗技术科 宁波 315400
- Keywords:
Calibration of output dose;
International Atomic Energy Agency(IAEA)TRS277;
International Atomic Energy Agency(IAEA)TRS381;
Electron beam;
Photon beam;
Flattening filter(FF)mode;
Flattening filter free(FFF)mode
- From:
China Medical Equipment
2024;21(1):29-33
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To calibrate the absorbed doses of the configured ray water with different gears of energies in accelerator based onof International Atomic Energy Agency(IAEA)277 and 381 reports,so as to ensure the accuracy of the output dose of the linear accelerator during clinical radiotherapy.Methods:Elekta Infinity linear accelerator was used in this study,and the photon beam energies were respectively 6MV flattening filter(FF)mode and 6MV flattening filter free(FFF)mode.The electron beam energies were respectively 4,6,8,10,12 and 15MeV.According to the IAEA TRS277 and TRS381 reports,the calibrations of output doses in photon and electron beam waters were performed respectively by using the PTW dosimeter,PTW30013 finger type of ionization chamber and PTW34001 parallel plate ionization chamber.The error of each step was analyzed,and the accuracies of the calibrations of using different standards for the output waters of linear accelerator were compared.Results:The output amounts of photon beams of FF mode and FFF mode of 6MV at the maximum dose point in water were respectively 1.003 and 1.008cGy/MU.The output amounts of the energy of each gear of electron beams of 4,6,8,10,12 and 15MeV at the maximum dose point in water were respectively 1.003,1.002,0.998,0.999,1.000 and 1.003 cGy/MU.The calibration of the output of each gear of energy rays at the maximum dose point in water was 1cCy corresponded to 1MU,which error was less than 1%.Conclusion:The calibration for the output dose amount of accelerator in water on the basis of IAEA TRS277 and trs381 can ensure the accuracy of the output dose of the accelerator.
