中文摘要：

在计算机辅助虚拟手术研究中，需要对三维模型进行切割。由此，提出了利用标志点及三角剖分构建三维网格模型的方法来切割三维模型，并对切割后断开的网格进行修补，最大程度避免切割部位失真。该方法已应用到颅外科手术仿真系统中，实践证明，该方法容易实现，且能够比较精确地切割三维模型，达到理想的效果。

英文摘要：

In the computer aided surgery simulation, the 3D model often need to be cut. For this problem, a method that based on landmarks to cut the 3D model is presented in this paper. First, the 3D mesh model is constructed by using landmarks and Delaunay Triangle. Second, the landmarks of the target part are extracted manually. Then, the target surface of this mesh model is cut. At last the disconnected mesh is repaired to avoid distortion. Experiment shows that this approach could cut the 3D model accurately.