中文摘要：

碰撞检测模块是虚拟内窥镜系统的重要组成部分。根据变形物体的碰撞检测要求及连续切割过程对网格结构的影响，提出了碰撞检测的层次包围盒结构修正方法。该方法针对网格中的单元剖分和网格优化的过程中网格单元变化采用子树替换、位置提升方法进行修正，可满足连续切割中正确碰撞检测和精确碰撞的要求.

英文摘要：

Collision detection module is important component in virtual endoscope system. According to collision detection requirement of deformation objects and the effects of continuous cutting process on lattice structure, the amending method on level bounding box in collision detection has been proposed. The method using subtree replacement and position promotion to amend bounding box structure to lattice units change in units decomposition and lattice optimization. The experiments show that our method can meet the requirement of correct collision detection and precise collision in continuous cutting.