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《Chinese Journal of Medical Physics》 2019-08
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Long-term stability analysis on output dose of medical accelerator

ZHOU Jun;HUANG Sheng;LIU Chongwu;HU Hou;HU Mingyang;HE Shui;Department of Radiation Oncology, Sichuan Provincial Corps Hospital of Chinese People's Armed Police Forces;  
Objective To analyze the long-term stability of the output dose of medical accelerator and discuss its influencing factors.Methods According to IAEA TRS 277 report, the absorbed dose measurement was performed on medical accelerators in Sichuan Provincial Corps Hospital of Chinese People's Armed Police Forces, and a total of 240 groups of output dose data from May 2012 to December 2017 were statistically analyzed. The long-term stability of the output dose of medical accelerator and its influencing factors were analyzed for providing methods and measures for the dose quality assurance of medical accelerator. Results The K-S test on 3 groups of 6 MV-X output doses showed that two-tailed progressive probability P values were 0.101, 0.269, and0.549, respectively, which were all greater than the significance level of 0.05 and accord with the standard normal distribution.The P value was gradually increased, and the degree of coincidence was also gradually increased. Moreover, the coincidence rates of dose error ≤1% and ≤2% were 91.94% and 97.92%, respectively. Conclusion The output dose of the medical accelerator in Sichuan Provincial Corps Hospital of Chinese People's Armed Police Forces has good normality and long-term stability, and can fully meet the needs of clinical radiotherapy. The main factors that affect the stability of the output dose of accelerator includes the self stable of accelerator hardware, the stable of dosimeter and ionization chamber, the accuracy of measurement method and setup errors, etc. Physicists should formulate an individualized accelerator dose quality assurance procedure according to the actual situation of the department, and calibrate the output dose according to the specified frequency, and monitor the stability of the output dose, thereby providing a guarantee for precision radiotherapy.
【Fund】: 乐山市重点科研项目(19SZD180)
【CateGory Index】: R197.39
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