Abstract

Info

Title:: Reconstruction of virtual liver and its deformation and cutting simulations

Author(s):: GAO Haiguo; JIA Shiyu; College of Computer Science and Technology, Qingdao University, Qingdao 266071, China

Keywords:: Keywords: liver anatomy model reconstruction surgical simulation soft tissue deformation simulation soft tissue cutting simulation

Abstract:: Abstract: To meet the requirements of simulation scene fidelity and real-time performance of deformation and cutting for virtual liver surgery simulation, 3 novel methods are proposed, including virtual volume envelope method, boundary condition settings based on anatomical structures, and two-level linked voxel method. The liver model for simulation is reconstructed according to its actual anatomical structures. Extrahepatic vessels in the form of surface models are embedded in the virtual volume envelope model for realizing deformation and cutting simulations. Boundary conditions are set on the ligament structures of the liver according to the analysis on the anatomical structures of the liver surface and the appropriate simplifications of its boundary constraints. The two-level linked voxel method reconstructed the liver model for simulation in two linked voxel grids with different levels. The original surface mesh is reconstructed in a fine level linked voxel grid, while the cut surface mesh is constructed in a coarse level linked voxel grid for reducing the computational load of deformation and cutting simulations. Simulation results show that the proposed methods can improve the running speed of the liver deformation and cutting simulations while maintaining the realism.