4D人体辐射剂量计算技术研究

Research on 4D radiation dose calculation of human body

当前人体辐射剂量计算技术只能给出直立人体3D静态剂量结果,无法满足未来精准防护需求。为实现4D剂量计算,首先基于刚体旋转矩阵、体积图拉普拉斯算子和近似刚体变换三种算法实现了面元模型变形;然后研究了动作捕捉引导的模型变形;接下来基于Delaunay算法的四面体切割技术实现了高速蒙特卡罗计算,最后设计开发了4D剂量计算应用系统。将建立的完整方法用于核电厂进行现场实验,针对特定辐射作业过程的应用结果验证了该方法的可靠性和实用性,突破了4D剂量计算过程中关键技术环节。未来该技术有望在核电厂运维、核设施退役治理及医学介入治疗等场景下实现人员精准防护。

[Background]The current radiation dose calculation technology can only give 3D static dose results of upright human body,which cannot meet the needs of future accurate protection.[Purpose]This study aims to achieve 4D dose calculation by establishing a complete method.[Methods]Firstly,three algorithms,namely,the rotation matrix method,the volume graph Laplace operator method and the As-Rigid-As-Possible(ARAP)method,were employed to realize the deformation of mesh phantom.Then the phantom deformation guided by motion capture was investigated,and the tetrahedral cutting technology based on Delaunay algorithm was applied to the high speed Monte Carlo calculation.Finally,the 4D dose calculation application system was implemented and used for field test of nuclear power plant(NPP).[Results]The comparison between the calculated and measured individual 4D dose values shows that the deviation of Hp(10)is less than 10%,and the deviations of Hp(3)and Hp(0.07)are less than 15%are verified.[Conclusions]The reliability and practicability of 4D radiation dose calculation of human body proposed in this study are verified by application results in specific radiation operation process in NPP,which is expected to achieve precise protection of personnel in the future scenarios such as NPP operation and maintenance,nuclear facility decommissioning and medical interventional treatment.