CAJ | 학술논문

目的研究使用免冲洗胶片测量后装机192Ir放射源到位精度及步进距离精度的方法.方法使用GAFCHROMIC(R)EBT3型免冲洗胶片对1台国产后装机192Ir放射源到位精度及步进距离精度进行测量.曝光后的胶片使用EPSON PREFACTION V700 PHOTO胶片扫描仪扫描成胶片分析软件要求的图像格式,然后用SNC Patient 5.2软件中的胶片分析软件对图像进行分析.结果以源活性中心为基准点,该后装机使用胶片法测量的192 Ir放射源到位精度为-0.75 mm.免冲洗胶片分析方法能够分辨2个驻留点间5 mm的步进距离精度,不能够分辨2个驻留点间2.5 mm的步进距离精度;2.5 mm步进距离精度可通过测量3个连续驻留点第1点和第3点间距离是否为5 mm的方法进行间接判断.该后装机使用胶片法测量的连续9个驻留点间的5 mm步进距离无偏差;2.5 mm步进距离精度间接判断结果无偏差.使用胶片法测量的后装机192Ir放射源到位精度符合国家标准要求.结论免冲洗胶片方法可以用于后装机192Ir放射源到位精度及步进距离精度的测量.
목적연구사용면충세효편측량후장궤192Ir방사원도위정도급보진거리정도적방법.방법 사용GAFCHROMIC(R)EBT3형면충세효편대1태국산후장궤192Ir방사원도위정도급보진거리정도진행측량.폭광후적효편사용EPSON PREFACTION V700 PHOTO효편소묘의소묘성효편분석연건요구적도상격식,연후용SNC Patient 5.2연건중적효편분석연건대도상진행분석.결과이원활성중심위기준점,해후장궤사용효편법측량적192 Ir방사원도위정도위-0.75 mm.면충세효편분석방법능구분변2개주류점간5 mm적보진거리정도,불능구분변2개주류점간2.5 mm적보진거리정도;2.5 mm보진거리정도가통과측량3개련속주류점제1점화제3점간거리시부위5 mm적방법진행간접판단.해후장궤사용효편법측량적련속9개주류점간적5 mm보진거리무편차;2.5 mm보진거리정도간접판단결과무편차.사용효편법측량적후장궤192Ir방사원도위정도부합국가표준요구.결론 면충세효편방법가이용우후장궤192Ir방사원도위정도급보진거리정도적측량.
Objective To study the method of measuring the position accuracy and the step distance accuracy of afterloading system with192Ir source by using flushing-free film.Methods The position accuracy and the step distance accuracy of a China-made afterloading system with192Ir source was measured by using GAFCHROMIC (R) EBT3 flushing-free film.The film was scanned to proper image format,required by dose analysis software,by EPSON PREFACTION V700 PHOTO scanner.Then images are analyzed by using film dose analysis software in SNC Patient 5.2.Results With focus on the center of active section of source,the position accuracy of this afterloading system with192Ir source was-0.75 mm.Using film analysis could make the step point to tell apart if the step distance was 5 mm away by the method of film analysis,but couldnot make it to tell apart if the step distance was 2.5 mm away.The 2.5 mm step distance accuracy could be judged if the distance between the 1 st point and the 3rd point was 5 mm,then the 2.5 mm step distance could be deemed to no deviation.The 5 mm step distance of this afterloading system had no deviation in continuous 9 step points measured by flushing-free film.The indirect measuring results of the 2.5 mm step distance had no deviation as well.The position accuracy of this afterloading system measured with the flushing-free film accorded with the national standards.Conclusions The method of measuring the position accuracy and the step distance accuracy of the afterloading system with192Ir source by using flushing-free film is technically feasible.