基于三维激光扫描技术的颌面三维测量与直接测量法的比较

The Comparison between 3D Laser Scanning and Direct Manual Measurement for Craniofacial Measurement

目的：设计基于三维激光扫描技术的颌面三维测量系统，并与直接测量法进行比较。方法通过三维激光扫描仪扫描28例志愿者正面、左侧面和右侧面的3幅图像，对图像进行坏点去除、补洞等前期处理，拼接经过前期处理的3幅图像并生成整体三维模型，利用自行开发的软件3D-FACE VIEWER进行颌面部直线、曲线、角度及比例的测量，并将测量结果与直接测量法得到的结果进行对比。结果三维扫描测量法的结果与直接测量法的结果相差不大。在56项点距测量中，49项测量误差不超过2~3 mm；在17项弧长测量中，7项测量误差不超过2~3 mm。结论基于三维激光扫描技术的颌面三维测量系统是一种良好可行的方法，三维测量系统3D-FACE VIEWER可以较准确地完成颌面的测量，具有一定的临床应用价值。

Objective To design a craniofacial measurement technique based on 3D laser scanning and to verify the system feasibility by comparing with direct manual method. Methods Twenty-eight volunteers were scanned from three directions by 3D laser scanner, including front, left side and right side. After generating these three 3D face images, the preprocessing was conducted, such as the removal of dead pixels and filling of the holes. Then these three images were merged to build a completed 3D face model. Then the Euclidean distance, geodesic distance, angles and ratios of all the items were measured by 3D measurement software 3D-FACE VIEWER developed by ourself. And the results were compared with direct manual measurements. Results The statistical difference between direct manual measurement and 3D measurement was not obvious. The error of 49 items among 56 Euclidean distance measurements and 7 items among 17 geodesic distance measurements were less than 2~3 mm. Conclusion The craniofacial measurement by 3D laser scanning is effective. The software 3D-FACE VIEWER is ideal for craniofacial measurement and worth of promotion.