Computerized restoration of nonhomogeneous deformation of a fossil cranium based on bilateral symmetry
Computerized restoration of nonhomogeneous deformation of a fossil cranium based on bilateral symmetry
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DOI：
10.1002/ajpa.20332
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发表时间：
2006-05-01
影响因子：
2.8
通讯作者：
Ishida, H
中科院分区：
文献类型：
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作者：
Ogihara, N;Nakatsukasa, M;Ishida, H
我们开发了一种基于中矢状面双边对称性的计算机化方法来校正化石头骨的塑性变形，并将该方法应用于重建 Proconsul heseloni 颅骨化石 (KNM-RU-7290A)。使用从计算机断层扫描中检索到的连续横截面图像生成了化石的三维 (3D) 模型。获取应位于正中矢状平面上的解剖标志的 3D 坐标以及应相对于该平面对称的标志对。然后重新定位这些地标，以满足几何约束，同时最小化地标的平移距离。我们采用薄板样条函数来数学描述获取的和重新定位的地标之间的 3D 非线性体积变换。利用这个功能，整个化石的形状发生了变化，并且扭转变形的效果可以被可视化。结果表明，该方法能够有效消除化石头骨的非均匀变形。由于方法学的限制，仅通过这种方法无法完全恢复头骨的生前外观。然而，由于其客观性质，所提出的方法可以作为传统修复技术的补充。 Am J Phys Anthropol 130:1-9, 2006。(c) 2005 Wiley-Liss, Inc.
We developed a computerized method of correcting plastic deformation of a fossil skull, based on bilateral symmetry with respect to the midsagittal plane, and applied this method to reconstruction of a fossilized Proconsul heseloni cranium (KNM-RU-7290A). A threedimensional (3D) model of the fossil was generated using consecutive cross-sectional images retrieved from computed tomography. 3D coordinates of anatomical landmarks that should be located on the midsagittal plane and pairs of landmarks that should be symmetrical with respect to this plane were acquired. These landmarks were then repositioned so that geometrical constraints were satisfied, while translated distances of landmarks were minimized. We adopted a thin-plate spline function to mathematically describe the 3D nonlinear volumetric transformation between acquired and repositioned landmarks. Using this function, the entire fossil shape was transformed, and the effect of reversing the deformation could be visualized. The results indicated that the proposed method was effective in eliminating nonhomogeneous deformation of the fossil skull. The antemortern appearance of the skull cannot be completely restored by this method alone, due to methodological limitations. However, the presented method has a role as an adjunct in complementing conventional restoration techniques on account of its objective nature. Am J Phys Anthropol 130:1-9, 2006. (c) 2005 Wiley-Liss, Inc.