虚拟手术仿真中人体软组织形变技术的研究

对虚拟手术仿真中人体软组织形变技术进行深入研究，利用OpenGL三维图形标准建立了基于质点-弹簧物理模型的虚拟人体软组织形变系统。围绕虚拟手术仿真中人体软组织形变的逼真度和实时性两大要素展开研究，通过对比四边形网格结构提出了改进的基于质点-弹簧模型的正六边形几何拓扑结构，并对软组织形变动力学模型及其数值积分算法、软组织形变力反馈计算模型进行了讨论，针对以往的虚拟手术器械与软组织表面接触时作用点的最近邻质点求取算法存在的不足，提出了改进的求取算法。实验结果表明，改进的算法在模拟软组织形变时具有较好的稳定性和实时性。

Research of tissue deformation in virtual surgery simulation

This paper studied the tissue deformation of Virtual Surgery Simulation, using OpenGL to establish the virtual tissue deformation system based on mass-spring model. Discussion was around the fidelity and real-time of tissue deformation in Virtual Surgery Simulation. By comparing quadrilateral topologies, regular hexagon topology based on mass-spring model was proposed, the dynamic model was discussed as well as its numerical integration method and force feedback calculation model of tissue deformation. Concerning the lack of nearest neighbor mass calculating algorithm in virtual surgical instrument contacting the tissue surface, a new method was proposed. The results show that the modified algorithms have better stability and real-time in tissue deformation simulation.