中文摘要：

针对虚拟手术系统中实时碰撞检测和软组织变形的问题进行了研究。对于实时碰撞检测，使用了包围盒检测结合三角面片检测的方法来检测物体之间的碰撞，并且找到相互碰撞的两个三角面片。对于软组织变形，使用了一种基于胡克定律的弹簧质点模型来虚拟仿真变形，并提供了控制点移动的方法。采用优化虚拟手术中的物体碰撞检测方法，减少了不必要的计算和增强了系统的精确度；简化了软组织变形的算法，相对加快了有限元模型运算速度。对推动虚拟手术的发展具有积极的意义和作用。

英文摘要：

This paper aims at solving the problem of collision detection and deformation of soft tissue in surgery simulation. This paper introduces a method that combines bounding boxes with polygons to find the polygons being collided. This paper also provides a spring model based on Hook＇s law to simulate deformation and several ways to move the control points. The method in this paper optimizes the collision detection. It can reduce the calculating time and improve the accuracy. This paper simplifies the algorithm used in deformation of soft tissue which is faster than FE methods. This paper has much positive meanings to surgery simulation.