3D Volumetric Model Construction of a Tooth with CT Images
基于CT图像的牙齿3维实体模型建立

The 3D volumetric model of a tooth is constructed based on the image data of CT cross-section layers.Each cross-section image,whose interval is 0.5mm and thickness is 1mm,is treated by two-value conversing,boundary extracting and boundary key points selecting.With the boundary key points of four neighborhood layers,three-dimensional solids between the two adjacent layers are produced according to 3D-Delaunay tetrahedron algorithm.Its validity of each solid element is checked if their internal products between the estimated outward normal vector and the vector from sphere center to vertex are all positive or not.All obtained valid 3D solid elements are combined with Boolean operation,and the volumetric model of a tooth is then achieved at last.This approach is proved to be simple and effective with a tooth sample.