蒙特卡罗技术在放射诊断剂量快速计算中的应用  

Application of Monte Carlo technology to fast dose calculation of radiation therapy

作　　者：管永红[1] 黄娇凤[1] 刘进[1] 刘军[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2013年第1期193-195,共3页High Power Laser and Particle Beams

基　　金：物理与生物交叉实验室项目(WSS-2011-051)

摘　　要：采用蒙特卡罗(MC)技术研究放射性核素131I的放疗特性。给出了131I衰变过程的MC抽样表达式,实现了含电子和光子的混合抽样模拟。对水客体中131I衰变的MC模拟结果表明:131I能够有效地治疗甲状腺肿瘤而几乎不影响正常组织。变密度客体的MC模拟结果表明:沉积能量与面密度之间的关系与密度无关,满足卷积核自适应的要求;并且MC模拟能够提供剂量卷积核函数,为快速剂量计算提供数据。The convolution core is the key factor to calculate dose with the convolution method in single-photon emission computed tomography （SPECT） diagnosis. The Monte Carlo （MC） technology was used to investigate the dose characteristic of the SPECT diagnosis with the radioactive isotope 131I. The expression of the 131I decay was given and was used to achieve the sim- ulation of the electron and the photon of one decay of the131I. The SPECT object is a spherical water phantom. The MC simula- tion results not only show that 131I can cure the hypothyroid caner and almost has no harm to the normal tissue, but also verify that the requirement of the self-adaption convolution core is met, for the relationship between the deposited energy and the areal mass is nothing to the density. The convolution core is gained by the MC simulation and is very useful to fast dose calculation.

关 键 词：放射性治疗 剂量计算 蒙特卡罗技术 剂量卷积核 

分 类 号：R581.1[医药卫生—内分泌]