[摘要]目的：介绍一种在CT三维模型复杂结构上辅助定点的方法，解决这些部位定点困难的问题。方法：间接使用计算机辅助设计(Computer-aided design，CAD)点与被测点重合的方法，通过读取CAD点的坐标值反映被测点的精确坐标。 结果：辅助定点法能够精确地对复杂的组织结构例如髁突顶点甚至是骨组织内部结构定点，误差小于0.3mm。结论：此方法简单易学，重复性好，信度高，是一种确实可行的精确定点方法。

    [关键词]三维重建；三维模型定点；三维测量

    [中图分类号]R783 [文献标识码]A [文章编号]1008-6455(2008)03-03

    Aided identifying landmark of the complicated structure on cranio-facial CT three-dimensional model

    GAO Feng1,GU Ze-xu1,LIU Lan2,GUO Yan3,KONG Liang1,DUAN Yin-zhong1

    (1.Department of Orthodontics, Stomatological College,the Fourth Military Medical University,Xi'an 710032,Shaanxi,China;2.Department of Stomatology, Shanxi Provincial Corps Hospital,Chinese People's Armed Police Forces;3.Health Center,Haixi Military Subarea,Military Zone of Qinghai Province,Chinese People's Liberation Army)

    Abstract: Objective In order to resolve the problem of precise identifying landmark on cranio-facial CT three-dimensional model, we introduce a new method of aided identifying landmark.MethodsAfter the CAD(Computer-aided design) point coincident with the common landmark ......