Bioengineering Research Laboratory, The Hand and Upper Limb Centre, St. Joseph's Health Care London, London, Ontario, Canada; Department of Mechanical and Materials Engineering, Western University, London, Ontario, Canada.
Med Eng Phys. 2013 Dec;35(12):1843-9. doi: 10.1016/j.medengphy.2013.06.006. Epub 2013 Jul 26.
During reconstructive surgery of the face, one side may be used as a template for the other, exploiting assumed bilateral facial symmetry. The best method to calculate this plane, however, is debated. A new semi-automatic technique for calculating the symmetry plane of the facial skeleton is presented here that uses surface models reconstructed from computed tomography image data in conjunction with principal component analysis and an iterative closest point alignment method. This new technique was found to provide more accurate symmetry planes than traditional methods when applied to a set of 7 human craniofacial skeleton specimens, and showed little vulnerability to missing model data, usually deviating less than 1.5° and 2 mm from the intact model symmetry plane when 30 mm radius voids were present. This new technique will be used for subsequent studies measuring symmetry of the facial skeleton for different patient populations.
在面部重建手术中，可以利用假设的双侧面部对称性，将一侧用作另一侧的模板。然而，计算该平面的最佳方法仍存在争议。本文提出了一种新的半自动化技术，用于计算面部骨骼的对称平面，该技术结合使用了从 CT 图像数据重建的表面模型、主成分分析和迭代最近点对齐方法。当应用于一组 7 个人类颅面骨骼标本时，与传统方法相比，该新技术发现能够提供更准确的对称平面，并且对模型数据的缺失具有较小的敏感性，当存在 30 毫米半径的空洞时，与完整模型对称平面的偏差通常小于 1.5°和 2 毫米。这项新技术将用于随后的研究中，以测量不同患者群体的面部骨骼对称性。
