利用蒙特卡罗方法设计医用加速器均整器  

Design Flattening Filter of Medical Accelerator Using Monte Carlo Method

作　　者：潘夫兴[1] 罗文芸[1] 周诗情[1] 董晓庆[1] 王传珊[1] 陈捷[1] 吴国华[2] 查元梓[2] 蒋马伟[2] 

机构地区：[1]上海大学射线应用研究所,上海200444 [2]上海交通大学医学院附属新华医院放疗科,上海200092

出　　处：《上海大学学报（自然科学版）》2011年第6期751-756,共6页Journal of Shanghai University:Natural Science Edition

基　　金：上海市科委基金重点资助项目(08JC1410200)

摘　　要：采用BEAMnrc程序构建医用直线加速器治疗头模型,模拟计算几种单一材料或复合材料构成的均整器对应的射野剂量分布情况.通过对各组射野离轴比(off-axial ratio,OAR)、离轴剂量分布和能量注量分布曲线进行分析并与GB 15213—94国家标准对照,设计具有较好均整度的复合材料均整器.讨论粒子角分布、X射线剂量利用率以及带电粒子污染问题,说明所设计的均整器具有射野内剂量分布平坦、粒子前向性好和带电粒子污染小等优点.Using BEAMnrc to model the beam geometry of medical linear accelerator treatment ray dose distribution for a field sized 10 cm × 10 cm is calculated after the X-ray passed head, X- through a flattening filter consisting of single material or multi-material. By comparing the resuhs of the off-axial ratio （OAR）, the off-axis dose distribution and off-axis energy fluence distribution curves under GB 15213-94, a multi-material flattening filter with better flatness is designed. Angular distribution of particles, X-ray dose rate and charged flattening filter has advantages including and low pollution of charged particles. particles pollution are discussed. The results show that this good flatness, satisfactory forward shooting property of particles,

关 键 词：BEAMnrc 均整器 相空间数据 离轴比 百分深度剂量 

分 类 号：TL53[核科学技术—核技术及应用]