Drerup B, Hierholzer E
Institut für Experimentelle Biomechanik, Westfälische Wilhelmus-Universität, Münster, F.R.G.
J Biomech. 1987;20(10):961-70. doi: 10.1016/0021-9290(87)90325-3.
A method for automatic measurement of anatomical landmarks on the back surface is presented. The landmarks correspond to the verteba prominens, the dimples of the posterior superior iliac spines and the sacrum point (beginning of rima ani), which are characterized by distinct surface curvature. The surface curvatures are calculated from rasterstereographic surface measurements. The procedure of isolating a region of interest for each landmark (surface segmentation) and the calculation of the landmark coordinates are described in detail. The accuracy of landmark localization was tested with serial rasterstereographs of 28 patients (with moderate idiopathic scoliosis). From the results the intrinsic accuracy of the method is estimated to be little more than 1 mm (depending on the sampling density of the surface measurement). Therefore, the landmarks may well be used for the objective definition of a body-fixed reference coordinate system. The accuracy is, however, dependent on the specific landmark and a minor influence of posture variations is observed.
本文提出了一种自动测量背部表面解剖标志点的方法。这些标志点对应于隆椎、髂后上棘凹陷和骶骨点（肛门裂孔起点），其特征为具有明显的表面曲率。表面曲率由光栅立体表面测量计算得出。详细描述了为每个标志点分离感兴趣区域（表面分割）的过程以及标志点坐标的计算。使用28例（中度特发性脊柱侧凸）患者的系列光栅立体图像对标志点定位的准确性进行了测试。根据结果估计，该方法的固有精度略高于1毫米（取决于表面测量的采样密度）。因此，这些标志点完全可用于客观定义身体固定参考坐标系。然而，精度取决于特定的标志点，并且观察到姿势变化有轻微影响。
