Literature analysis of output dose verification for linear accelerators in China
Objective To analyze the current situation of dosimetry audits for linear accelerators in China comprehensively based on the literature,including the range of output dose deviation and the qualified rate of output dose deviation.Methods Literature search including non-full-text was carried out in CNKI database for literature on output dose verification using dosimeter comparison and quality control test,respectively.Data extraction and analysis were carried out for each kind of eligible literature.The data on the number of tested linear accelerators,the number of qualified linear accelerators,the qualified rate of output dose deviation and the range of output dose deviation were extracted,and the total qualified rate of output dose deviation was calculated based on the total number of tested linear accelerators and the total number of qualified linear accelerators.The data on qualified rate of output dose deviation and output dose deviation in past years were sorted out and their trend was analyzed.Results A total of 11 literatures using dosimeter comparison method for output dose verification were retrieved,and the total qualified rate of the output dose deviation reported in these literatures was 90.7％.The qualified rate of the output dose deviation in the early years was either as low as 75％or as high as 100％,and remained around 90％in recent years.A total of 19 literatures using quality control test method for output dose verification were retrieved,and the total qualified rate of X-ray and electron beam output dose deviation reported in these literatures was 86.5％and 78.4％,respectively.Of the 12 data on X-ray output dose qualified rate in 2014-2019,8 were below 90.0％and 4 were above 90.0％.Of the 7 data on X-ray output dose qualified rate in 2020-2023,2 were below 90.0％and 5 were greater than or equal to 90.0％.The qualified rate of electron beam output dose was 46.2％-80.0％before 2021 and 100％from 2021 to 2023.Conclusions The qualified rate of the output dose deviation of linear accelerators in China reported in the literature in recent years is on the rise,but the total qualified rate of the output dose deviation of linear accelerators in China is still lower than in developed countries.In order to ensure the therapeutic effect of the patients undergoing radiotherapy,measures should be taken to reduce the output dose deviation of linear accelerators and improve the level of qualified rate of output dose verification.
Dosimetry auditsOutput dose deviationLinear acceleratorsTLD comparisonQuality control test
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