利用MRI三维男性人体模型对航天员所受空间辐射的估算(英文)  

Estimates of Space Radiation Exposure to Astronauts Using Male Voxel Model Based on MRI

作　　者：贾向红[1] 许峰[1] 黄增信[1] 吕兑财[1] 曾志[1] 李君利 

机构地区：[1]中国航天员科研训练中心,北京100193 [2]Department of Engineering-physics,Tsinghua University,beijing100084

出　　处：《航天医学与医学工程》2008年第4期299-303,共5页Space Medicine & Medical Engineering

基　　金：Supported by the advanced space medico-engineering research project of China (01100305)

摘　　要：目的建立空间辐射环境下,航天员器官所受辐射剂量及对其健康危险的计算方法。方法利用符合航天员体征的人体MRI图像,建立三维男性人体模型及辐射数据库,并结合蒙特卡罗粒子输运程序GEANT4用于剂量计算。结果我们得到了模拟各向同性抽样情况下,10MeV到500MeV单个质子对人体辐射敏感器官的吸收剂量及有效剂量。结论在航天员体征三维人体模型及辐射数据库的基础上,利用空间舱内测量质子谱,得到了舱内累计剂量。计算的皮肤剂量为148.6μGy/d,该值与美国和俄罗斯发表的数据100 ～300μGy/d比较接近。Objective To predict the astronaut organs radiation exposure and related health risks in the space radiation environment, the calculated method is studied. Methods A male voxel human model based on MRI and radiation data bank was build. The calculation was carried out with Monte Carlo particle transporting program GEANT4. Results The organ absorbed dose distribution and the effective doses to the model in isotropic proton fields with energies ranges from 10 MeV to 500 MeV were obtained. Conclusion Based on the Chinese astronaut voxel model and the data set of proton spectrum measured in the space cabin, the cumulated dose in the model is gotten. The calculated skin dose is about 148.6 μGy/d, which is within in the range of 100 -300μGy/d, published by USA and Russia.

关 键 词：人体模型 磁共振成像 剂量 质子 蒙特卡罗粒子运输程序 GEANT4 

分 类 号：R852.7[医药卫生—航空、航天与航海医学] R857.3[医药卫生—临床医学]