Research On Modeling Of Posture-Variable Radiation Virtual Human Model

Radiation Virtual Human (RVH) is an important condition for radiation simulation, so it is of great significance to research modeling method of RVH. The current mainstream RVH is the Tomographic Model, most of which are in standing posture. This does not meet the actual situation, because in actual scene of radiation human may be in different postures. Therefore, this dissertation researches on modeling method of Posture-Variable Radiation Virtual Human (PVRVH) and the main work of this dissertation goes as follow:(1) Related research of RVH is investigated comprehensively. By analyzing the significance and difficulties in developing PVRVH, this dissertation proposed the multi-layer-structure PVRVH. The main characteristic of this model is combination of technical of human animation and tomographic models(2) Two-Layer-Structure Method which presents PVRVH is proposed. Based on the functions and representation principles of PVRVH which are concluded and summarized, PVRVH represented by physical structure and logical structure is proposed in this dissertation. Logical structure is the abstraction of functions of PVRVH and the physical structure is a concrete implementation of logical structure. By separating the functions and implementation of PVRVH, Two-Layer-Structure Method can cover all functions of PVRVH and be modeled flexibly according to actual situation.(3) Skeleton system of PVRVH is implemented by drawing on relevant technique in H-Anim standards of Human Animation field. Posture transform of PVRVH is implemented by rotating joints in skeleton system.(4) Organ deformation of PVRVH is implemented. Combining with both skeleton system of PVRVH and traditional FFD method, Skeleton-Manipulation based FFD algorithm is proposed and organ deformation of PVRVH is implemented based on this algorithm.