激光点云结合逆向工程快速构建软组织立体模型在美容外科的应用

Combination of laser-point cloud and reverse engineering to rapidly establish a three-dimensional soft tissue model in cosmetic surgery

背景:面部美容手术设计及医患沟通相比创伤整复手术更为精细,因此需要采集高精度的面部数据,重建更高精度的三维模型。目的:旨在探究激光三维扫描设备和匹配的图形数据处理软件对面部进行精确的数据采集及形态学分析在现代美容外科中的应用前景。方法:采用手持式激光扫描仪获取2例面部软组织缺损或对颜面外观不满意要求进行面部轮廓整形者患者术前面部点云数据,构建面部可视化三维模型,在此模型基础上进行面部轮廓的测量分析以及美容外科手术模拟和术后效果分析评价。结果与结论:整形前在NURBS曲面模型上模拟手术,整形后将模拟效果模型与术后模型进行3D比较,经偏差分析,整形后模型和模拟整形模型离异度在1 mm内的比率>80%。结果说明,激光点云结合逆向工程技术,能够快速构建面部三维数字模型,为临床美容设计提供准确的三维数据指导及效果的量化检验。

BACKGROUND： The design and communication of cosmetic operation is more refined than that of traumatic operation. Thus, more accurate data should be acquired and more precise three-dimensional models should be reconstructed. OBJECTIVE： To investigate the prospect of 3D laser scanner and matched graphics-processing software which acquire and analyze facial morphological data in the modern cosmetic surgery. METHODS： We obtained the point clouds of the facial surface in two cases of facial soft tissue defects or dissatisfied facial appearance using a hand-held laser scanner to reconstruct a visualized facial model, which was used for measurement of facial profile, simulation of cosmetic operation and evaluation of the therapeutic effects. RESULTS AND CONCLUSION： We simulated and designed upon the NURBS model before the operation primarily. Then the three-dimensional comparison was done between the simulate model and the postoperative model. Deviation analysis showed that the ratio of variation degree of the two models within 1 mm was more than 80%. It enables the rapid three-dimensional reconstruction of the facial surface by the combination of reverse engineering and laser scanning, thus providing accurate three-dimensional data for cosmetic design and quantitative evaluation of therapeutic effects in cosmetic surgery.