Research On Adaptive Hybrid Modeling Technologies In Virtual Surgery

The progress of virtual reality technology base on the fast development of computer graphic. The generation of virtual surgery base on the incorporation of modern medicine and virtual reality technology. The objective of virtual surgery research is to provide a reusable and realism environment in the aspect of visualization and force feedback. It is applied on surgery planning, operation guidance, surgery education and operation recovery. Therefore, the researches for this field have important theoretical significance and bright future in medicine. Based on viscoelastic model, the liver tissue was modeling, simulation and analysis in this paper. The main contributions of the paper includes the following aspects.First, we analyze the background, significance, research status and future development trend of virtual surgery and study the important parts and key technologies of virtual surgery simulation system. Paper analyzes the advantages and disadvantages of the spring-mass model, finite element model, boundary element model and non-model grid Galerkin model and some other typical models. We study some important evaluation indexs about how to evaluate the soft tissue deformation model.Second, aiming at the problems existing in the soft tissue model, We build a compling of adaptive Galerkin-based Meshfree and Mass-Spring model based on viscoelastic model. The soft tissues are divided into two parts: operation area and non-operation area. In the operation area, adaptive Galerkin-based Meshfree method is applied, while in the non-operation area, Mass-Spring Model is employed. In order to establish a smooth transition between Meshfree domain and Mass-Spring, transitional unit needs to be built. In order to further improve the real-time performance of the model, we put forward the double adaptive Galerkin-based Meshfree and generalized surface mesh model. The model of surface mesh is used in the region of the non-surgical generalized to further improve the real-time performance of the model.Finally, in this paper, the simulation has been implemented for the double adaptive Galerkin-based Meshfree model and generalized surface mesh model.We made a analysis for the simulation result. Experimental results show that the proposed double adaptive Galerkin-based Meshfree and generalized surface mesh model can satisfy the requirement of authenticity and real-time performance, verifing the authenticity and validity of the model.