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    • 23. 发明授权
    • Method of determining the long axis of an object
    • 确定物体长轴的方法
    • US07033327B2
    • 2006-04-25
    • US10243362
    • 2002-09-13
    • Richard E. Raby
    • Richard E. Raby
    • A61B5/103A61B5/117
    • A61B5/103A61C2007/004G06T7/66G06T7/73G06T2207/30036
    • The long axis of an object that is complex in shape, such as a tooth, may be accurately determined using digital data representing the shape of the object. A polyhedron is defined such that the center of the polyhedron coincides with a point representing the centroid of the object. Axis lines are then determined by establishing reference lines through each face of the polyhedron and the point representing the centroid of the object. The moment of the object is calculated about each axis line, and the axis line that corresponds to the smallest calculated moment is selected. Additional iterations of the method are then carried out by recursively subdividing the corresponding face into smaller sections until a desired angular accuracy is achieved. The method is particularly useful for orthodontic diagnosis and treatment.
    • 可以使用表示对象的形状的数字数据来精确地确定形状复杂的物体(例如齿)的长轴。 多面体被定义为使得多面体的中心与表示对象的质心的点重合。 然后通过建立通过多面体的每个面的参考线和表示对象的质心的点来确定轴线。 关于每个轴线计算物体的时刻,并选择与最小计算时刻对应的轴线。 然后通过将对应的面递归地细分为更小的部分直到实现期望的角度精度来执行该方法的附加迭代。 该方法对于正畸诊断和治疗特别有用。