中文摘要：

提出了一种可以在长骨骨折手术前获取目标固定钢板几何参数的仿真方法。该方法主要包括以下步骤：通过CT扫描获取骨折部位的序列断层图像，利用Curvelet变换对CT序列图像进行去噪处理并建立三维模型；根据长骨的形状特征，提取两个断骨的轴线进行空间配准，并驱动两个断骨进行模型预配准；使用网格顶点法矢特征分割得到两个断骨截面；采用基于非迭代估计的配准方法对两个断骨截面进行配准操作，并驱动两个断骨进行模型精配准；拟合出预弯钢板的形态，测量其几何参数。通过对肱骨骨折和腓骨骨折进行的模拟实验，证明此方法可以精确地建立预弯钢板模型，缩短手术时间，提高手术质量。

英文摘要：

The paper proposes a novel simulation method of obtaining the geometric parameters of a target fixation plate before the long bone fracture operation. Its main processing scheme consists of the following steps： First, Curvelet transform is utilized to denoise CT images of the fracture part and 3-D models are reconstructed; Second, axial lines of fractured bones are extracted and spatially aligned, and also the fractured bone models are driven to pre-register; Third, a method based on vertex normal feature is utilized to obtain the fractured .bone sections; Fourth, a method based on the non-iterarive estimation is used to align sections and to drive the fractured bone models to close register; Finally, an accurate NURBS surface fitting method is used to fit the plate, and the geometric parameters are measured. Humeral fracture and fibular fracture are chosen as the experimental subjects. The method proposed is proved effective in precise construction of the prebent plate model, which would shorten the operating time and improve the quality.