中国数字人体男性数学模型建立及外辐射模拟  

Development of Chinese adult male mathematical phantom and external radiation dose calculations

作　　者：孙文娟[1] 谢添武[1] 韩道[1] 刘谦[1] 

机构地区：[1]华中科技大学武汉光电国家实验室(筹),Britton Chance生物医学光子学研究中心,武汉430074

出　　处：《强激光与粒子束》2013年第1期182-188,共7页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(10875047,30700214),国家自然科学基金青年基金项目(31100821);新世纪优秀人才支持计划项目(NCET-10-0386)

摘　　要：基于"中国数字人男一号"高分辨人体结构数据集,通过最小包围盒方法获取中国数字人体男性体素模型各器官空间位置和尺寸信息,建立了中国数字人体男性数学模型,并通过变形实现了不同身高模型的构建。采用蒙特卡罗方法进行了不同能量下光子中子的外部辐射模拟。通过结果对比发现,数学模型与体素模型模拟结果趋势一致,但器官位置和质量对剂量影响较大,低能级下尤为明显。对于不同身高模型,小型个体剂量大于大型个体,深层器官剂量较浅层器官对器官尺寸更为敏感。数学模型定义简单,存储空间小,有利于人体辐射剂量的快速计算。A new mathematical phantom, the Chinese MIRD （CMIRD）, was developed based on the high-resolution data set of Visible Chinese Human （VCH）. The position and size of organs were obtained from the voxel-based VCH model, using the minimal 3D bounding box method. According to the equations of the ORNL adult phantom, the original CMIRD based on that an- atomic information was constructed and the method of proportional deformation was adopted in order to compare the external radi- ation dose of different height models for different radiation directions and particles with MCNPX. The stimulation results obtained from CMIRD present comparable to those published dose values. The analysis of the discrepancies indicates that the shape, loca- tion and mass of organs have great influence on radiation dose especially at low energies. The comparison of the effective doses for models with different size shows that the size of the model is important, and the smaller models receive larger doses. Also, the deeper organs present more sensitive to the organ size than the shallower ones. In addition, the mathematical model is superior in speed of the radiation dose calculation, which requires simpler definition and less memory space.

关 键 词：数字人体 数学模型 蒙特卡罗方法 剂量计算 

分 类 号：Q612[生物学—生物物理学]