利用蒙特卡罗方法设计医用加速器均整器

doi:10.3969/j.issn.1007-2861.2011.06.012

上海大学学报(自然科学版) ›› 2011, Vol. 17 ›› Issue (6): 751-756.doi: 10.3969/j.issn.1007-2861.2011.06.012

利用蒙特卡罗方法设计医用加速器均整器

潘夫兴, 罗文芸, 周诗情, 董晓庆, 王传珊

（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）

出版日期:2011-12-28 发布日期:2011-12-28
通讯作者: 罗文芸（1965~），女，副研究员，研究方向为荷能粒子在物质输运过程中的计算机模拟、辐射防护等. Email：wyluo@shu.edu.cn
基金资助:
上海市科委基金重点资助项目（08JC1410200）

Design Flattening Filter of Medical Accelerator Using Monte Carlo Method

(1. Shanghai Applied Radiation Institute, Shanghai University, Shanghai 200444, China; 
2. Department of Radiation Therapy, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China)

Online:2011-12-28 Published:2011-12-28

摘要/Abstract

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.

关键词:

BEAMnrc, 百分深度剂量, 均整器, 离轴比, 相空间数据

Abstract: Using BEAMnrc to model the beam geometry of medical linear accelerator treatment head, X-ray dose distribution for a field sized 10 cm×10 cm is calculated after the X-ray passed through a flattening filter consisting of single material or multimaterial. By comparing the results 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 particles pollution are discussed. The results show that this flattening filter has advantages including good flatness, satisfactory forward shooting property of particles, and low pollution of charged particles.

Key words: BEAMnrc, flattening filters, off-axial ratio (OAR), percentage depth dose (PDD), phase space files

中图分类号:

TL 53
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TL 53

潘夫兴, 罗文芸, 周诗情, 董晓庆, 王传珊. 利用蒙特卡罗方法设计医用加速器均整器[J]. 上海大学学报(自然科学版), 2011, 17(6): 751-756.

BO Fu-Xin, LUO Wen-Yun, ZHOU Shi-Qing, DONG Xiao-Qiang, WANG Chuan-Shan-. Design Flattening Filter of Medical Accelerator Using Monte Carlo Method[J]. Journal of Shanghai University（Natural Science Edition）, 2011, 17(6): 751-756.

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

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