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.

This study aims to achieve 4D dose calculation by establishing a complete method.

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).

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.

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.