参数化股骨曲面特征模型的构建

Construction of Femur Model Based on Parametric Surface Feature

为了便于参数化股骨曲面模型的编辑修改,利用曲面特征将股骨的网格模型分割为有医用意义的曲面特征单元,提出建立股骨曲面特征模型的方法.首先结合医学解剖需求,将由平均化点云模型构建的三角网格模型分割为有特定意义的多个区域,构成特征区域;其次设计特征参数及参数间约束关系,通过轮廓线蒙皮创建特征曲面;最后将相邻特征曲面通过过渡曲面连接,生成股骨参数化CAD曲面模型.实验结果表明,该方法能够有效地表达股骨表面形状特征,利用高层参数对股骨模型直观地进行构建和编辑,为股骨假肢设计以及不完整股骨的数字化修复等提供基础工具.

To facilitate the editing and modifying of parametric femoral surface model, by dividing the fe-moral mesh into surface feature units bearing medical significance based on surface feature technology, a new approach of constructing femoral surface feature models is proposed. Firstly, combining requirements of medical anatomy, the femoral triangle mesh model generated from the averaged point-clouds is divided into several specific regions, which are called feature regions; Secondly, feature parameters are defined and con-straints among them are set up, and feature surfaces are created by skinning the contours; Finally, the adja-cent feature surfaces are connected by transition surfaces. Thus the parametric CAD surface model of femur is constructed. Experimental results show that, with the proposed method, femoral surface shape features can be effectively represented, and the femur model can be intuitively constructed and edited with high-level parameters. The proposed method provides a basic tool for the design of femoral prostheses and the digital restoration of incomplete femurs.