目的：比较两种利用数字化技术三维定量确定人面部对称度的方法。方法：利用FaceScan三维激光扫描仪，获取20名受试者面部三维表面数据，将数据导入逆向工程软件Imageware 13.0和Geomagic 12，以YZ平面为镜像平面对其进行镜像，将本体和镜像图像利用迭代最近点算法（interactive closest point，ICP）和普氏分析法（Procrustes analysis，PA）重合，分别提取其正中矢状面，计算21个解剖标志点到正中矢状面的距离和不对称度，并进行比较分析。结果：对20个受试样本21个测量值进行配对t检验，得到t=1.346，P=0.193。结论：对于无明显不对称研究对象而言，ICP算法和PA算法都可以得到其正中矢状面，但是两种算法求得的正中矢状面之间无明显差异。

Objective：To compare two digital methods of quantitatively accessing the degree of facial asymmetry by three-dimensional data. Methods: The three-dimensional data of 20 subjects were got by the FaceScan, and then were input to the reverse engineering software Imageware 13.0 and Geomagic 12. Their mirror data were acquired and superimposed with the original data by the methods of interactive closest points (ICP) and Procrustes analysis (PA). The mid-sagittal planes of the two methods were extracted respectively, the degree of facial asymmetry and the distance of 21 automatic landmarks to midsagittal plane were calculated and compared. Results: The paired t test was taken and t=1.346, P=0.193. Conclusion: We can safely come to the conclusions that for the subjects with no evident facial asymmetry, there are no significant difference between the PA and the ICP methods for extracting the mid-sagittal plane from three-dimensional data.