加速器机头散射对三维水箱数据采集的影响  

Effect of Accelerator Head Scattering on Data Collection of 3D Water Tank

作　　者：叶芝甫 王彬[3] 常元智 汪伦 张文利 屈国普[1] YE Zhi-fu;WANG Bin;CHANG Yuan-zhi;WANG Lun;ZHANG Wen-li;QU Guo-pu(University of South China,Hengyang Hunan 421001 ,China;The First Affiliated Hospital of Guangxi University of Chinese Medicine,Nanning Guangxi 530000,China;Sun Yat-sen University Cancer Center,State Key Laboratory of Oncology in South China,Collaborative Innovation Center for Cancer Medicine,Guangzhou 510060,China)

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001 [2]广西中医药大学第一附属医院,广西南宁530000 [3]中山大学肿瘤防治中心,华南肿瘤学国家重点实验室,肿瘤医学协同创新中心,广州510060

出　　处：《核电子学与探测技术》2019年第2期240-244,共5页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金(11175083);湖南省自然科学基金(2018JJ2314)资助

摘　　要：将三维水箱中央控制单元在数据采集时分别放置于离加速器小机头1 m、4 m处,在保证其余条件和采集流程不变的情况下先后采集两套数据,比较两套数据的差异。使用Oncentr。计划系统分别基于以上两套数据进行建模,比较开野和临床病例剂量计算结果的差异。实验结果表明:百分深度剂量和射野离轴比野外剂量偏高,小野输出因子偏大,大野输出因子偏小。用受加速器机头散射影响较大的数据建模后,方野和病人剂量计算结果均较正常数据明显偏高。The central control unit of the three-dimensional water tank is placed at 1 m and 4 m away from the small head of the accelerator during data acquisition. Two sets of data are collected and the difference between the two sets of data is compared while ensuring that the remaining conditions and the acquisition process are unchanged. The Oncentro planning system was used to model the above two sets of data, respectively, to compare the difference between the wild-type and clinical case dose calculation results. The experimental results show that the deep dose of the deep depth dose and the off-axis of the field are higher than the field dose, the output factor of Ono is too large, and the output factor of Ono is too small. After modeling the data that was greatly affected by the scattering of the accelerator head, both the field and patient dose calculation results were significantly higher than the normal data.

关 键 词：计划系统建模 剂量计算 百分深度剂量 离轴比 射野输出因子 

分 类 号：TL72[核科学技术—辐射防护及环境保护]