基于激光扫描的面部软组织三维模型准确性评估

目的 评估基于激光扫描所建立的面部软组织三维模型和软组织测量标志点的准确性.方法 在一受试者的面部进行标志点标记,直接测量各标记点间的距离,之后使用Minolta Vivid 9i三维激光扫描仪进行面部扫描合成三维图像后,应用软件测量标记点间距离,对比两种方法的差异.另选择10名成年女性,在激光扫描前预先标记左右耳屏中点为固定标志点,再选取面部其余测量标志点22个.直接测量耳屏点与测量标志点间的距离,之后测量三维成像后耳屏点与测量标志点间距离,对比两者的差异.所有数据进行配对t检验.结果 基于激光扫描所建立的面部软组织三维模型的准确度为（0.72±0.51）mm.其中水平向、垂直向和前后向的准确度分别为（0.70±0.41）mm、（0.73±0.47）mm和（0.72±0.54）mm.59％的软组织测量标志点具有较高的准确性.结论 基于激光扫描的面部软组织三维模型具有较好的准确性.

Validity of a 3D surface laser scanner for measuring facial morphology

Objective The purpose was to evaluate the validity of a 3-dimensional facial scanning technique for measuring facial morphology.Methods Firstly,this study was concentrated on validity,evaluating measuring differences between distances between chosen anthropometric points on the 3D-generated facial images and distances between corresponding points on a live subject.Secondly,other ten adult females were selected,whose bilateral tragus points were marked in advance.The study was to measure distances between tragus and other facial points both on 3D-generated facial images and on live subjects,and to compare them.Results It was found that an validity of （0.72±0.51） mm was obtained of the 3D images.The validity on X,Y and Z axis was （0.70±0.41） mm、（0.73±0.47） mm and （0.72±0.54） mm respectively.59% ofmeasurementpoints gained high validity.Conclusions The surface laser scanner has relative high validity in reconstructing 3D facial morphology.