Ahn Woojin, Joo Jae Kyoung, Woo Hyun Soo, Lee Doo Yong, Yi Sun Young
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.
Stud Health Technol Inform. 2006;119:1-6.
This paper presents a centerline-based parametric model of colon for collision detection and visualization of the colon lumen for colonoscopy simulator. The prevailing marching cubes algorithm for 3D surface construction can provide a high resolution mesh of triangular elements of the colon lumen from CT data. But a well organized mesh structure reflecting the geometric information of the colon is essential to fast and accurate computation of contact between the colonoscope and colon, and the corresponding reflective force in the colonoscopy simulator. The colon is modeled as parametric arrangement of triangular elements with its surface along the centerline of the colon. All the vertices are parameterized according to the radial angle along the centerline, so that the triangles around the viewpoint can be found fast. The centerline-based parametric colon model has 75,744 triangular elements compared to 373,364 of the model constructed by the marching cubes algorithm.
本文提出了一种基于中心线的结肠参数模型，用于结肠镜模拟器的碰撞检测和结肠腔可视化。用于三维表面构建的流行的移动立方体算法可以从CT数据中提供高分辨率的结肠腔三角形元素网格。但是，反映结肠几何信息的组织良好的网格结构对于结肠镜模拟器中结肠镜与结肠之间接触的快速准确计算以及相应的反射力至关重要。结肠被建模为三角形元素的参数排列，其表面沿着结肠的中心线。所有顶点根据沿中心线的径向角进行参数化，以便可以快速找到视点周围的三角形。基于中心线的参数结肠模型有75,744个三角形元素，而通过移动立方体算法构建的模型有373,364个。
