医学图像3维重建模型的虚拟剖切算法

对医学图像体数据及重构几何模型进行虚拟剖切,可以方便地看到内部的组织,便于观察和诊断,可用于医疗放射治疗规划.针对医学图像重建的表面几何模型,提出了对模型进行平面剖切、立体开窗及任意交互切割的算法.平面剖切和开窗是用剖切面或剖切体对重建模型施以剖切,在剖切面上生成边序列及顶点序列;由此边序列和顶点序列生成封闭的边界轮廓,确定各轮廓的包含关系;对封闭轮廓包围的截面区域进行Delaunay三角剖分,得到完整的剖切后的表面模型.任意交互切割过程是交互生成切割路径,确定切割边界,并沿切割边界对表面模型进行切割.实验结果证明了本文算法的有效性.采用本文算法可得到良好的虚拟剖切效果.

Virtual Cutting Algorithms for 3D Surface Model Reconstructed from Medical Images

With virtual cutting operation for volume data of medical images or reconstructed geometry models from medical images, inside tissues can be observed easily, which can aid doctors to diagnose. The methods can also been used in surgery planning of radiotherapy. In this paper, new methods of plane cutting, stereo clipping and arbitrary cutting operations of 3D surface model reconstructed from medical images are presented. In plane cutting and stereo clipping methods, the 3D model is cut by plane or polyhedron. Lists of edge and vertex in every cut plane are established. From these lists the boundary contours are created and their embracing relationship is built. The region enclosed by the contours is triangulated using Delaunay triangulation algorithm. The procedure of arbitrary cutting operation is to create cutting path interactively at first, then build cutting boundary, and finally cut the model with the boundary. The cut model still maintains its correct topology structure. Experiments show the efficiency and stability of the methods. Good results are achieved by using the methods to cut models reconstructed from medical images.