A daily quality assure procedure for the on board imager and analysis of the results
10.3760/cma.j.issn.1004-4221.2012.06.023
- VernacularTitle:机载影像系统日检质控程序及结果分析
- Author:
Qiu GUAN
;
Nan LI
;
Nan LIU
;
Tingtian PANG
;
Jie QIU
;
Fuquan ZHANG
- Publication Type:Journal Article
- Keywords:
On board imager system;
Quality assure;
Images alignment
- From:
Chinese Journal of Radiation Oncology
2012;(6):560-562
- CountryChina
- Language:Chinese
-
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 lcft-right (LR) dircction and 0.8 mm in superior-inferior (S1) 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.
