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机载影像系统日检质控程序及结果分析
管秋, 李楠, 刘楠, 庞廷田, 邱杰, 张福泉
100730 北京,北京协和医学院 中国医学科学院北京协和医院放疗科
A daily quality assure procedure for the on board imager and analysis of the results
GUAN Qiu, LI Nan, LIU Nan, PANG Ting-tian, QIU Jie, ZHANG Fu-quan
Department of Radiotherapy, Peking Union Hospital, Chinese Academy of Medical Sciences, Pecking Union Medical College, Beijing 100730, China Corresponding author:QIU Jie, Email:qiujie@yahoo.cn
Abstract：Objective Performing a daily quality assure (QA) program to get variation and error range of on board imager (OBI) system, so that the OBI system can meet the needs of clinical treatment. Methods The daily QA program including:mechanical accuracy, 2D/2D Shift calculations accuracy, couch motion accuracy. Results The max deviation was －0.7 mm in left-right (LR) direction and 0.8 mm in superior-inferior (SI) direction in Linac& OBI isocenter accuracy check. The max deviations in 4 blades (x1,x2,y2,y1) position accuracy check were:－2.1 mm, 2.2 mm, ±1.7 mm, －2.1 mm. In OBI mechanical arms position accuracy check, 31% standard data was 85.2 cm with 0 mm deviation;69% standard data was 85.1 cm with 1 mm deviation. In LR, SI and anterior-posterior direction,2D/2D shift calculations accuracy was 0.46 mm,1.35 mm, －0.04 mm and couch motion accuracy was －0.1 mm,0.3 mm,0.2 mm,respectively. Conclusions By performing the daily QA program, it could be found whether OBI works properly and satisfies the clinical use. The physicist can pay more attention to the parameters which change frequently, and adjust the frequency of the parameters which are stable, so that working efficiently.
GUAN Qiu,LI Nan,LIU Nan et al. A daily quality assure procedure for the on board imager and analysis of the results[J]. Chinese Journal of Radiation Oncology, 2012, 21(6): 560-562.
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2012, Vol. 21 
