Huysmans T, Haex B, De Wilde T, Van Audekercke R, Vander Sloten J, Van der Perre G
Department of Mechanical Engineering, Faculty of Applied Sciences, Katholieke Universiteit Leuven, Kasteelpark Arenberg 1, B-3001 Heverlee, Belgium.
Gait Posture. 2006 Aug;24(1):54-61. doi: 10.1016/j.gaitpost.2005.07.002. Epub 2005 Aug 19.
This paper explains how the shape of the spine can be evaluated from back surface measurements in a recumbent position, by using point distribution models (PDM) and typical shape variability of the spine in a lateral sleeping position. CT-scans of 12 volunteers were taken in this posture on a firm and a soft sleeping system to provide a training set for the PDM. Active shape models (ASM) were used to enhance the accuracy of the spinal reconstruction from measurements by limiting the shape of the spine to characteristic shapes from a biomechanical and/or clinical point of view. A comparison was made between calculated shapes, obtained from surface measurements, and those measured vertebral body centres (from CT-scans). An RMS accuracy of 2.6mm was obtained in 3D, and 1.8mm in frontal view, which was sufficient to compare spinal deformations of a subject on different sleeping systems.
本文解释了如何通过使用点分布模型（PDM）和脊柱在侧卧位的典型形状变异性，从仰卧位的背部表面测量来评估脊柱形状。12名志愿者在这种姿势下在硬床垫和软床垫睡眠系统上进行了CT扫描，以提供用于PDM的训练集。主动形状模型（ASM）用于通过从生物力学和/或临床角度将脊柱形状限制为特征形状来提高测量脊柱重建的准确性。对从表面测量获得的计算形状与测量的椎体中心（来自CT扫描）进行了比较。在三维中获得了2.6毫米的均方根误差，在正视图中为1.8毫米，这足以比较受试者在不同睡眠系统上的脊柱变形。
