两种面部软组织三维图像重叠方法准确性和可靠性的初步研究

Accuracy and reliability of the superimposition methods of facial 3D scanning images

目的 评估两种面部软组织三维图像重叠方法的准确性和可靠性,为临床选择适宜方法分析正畸治疗前后面部软组织变化提供依据.方法 分别采用半表面配准法和定点十区域组合重叠法对10名研究对象即刻与3分钟后和即刻与3天后（T0-T1/T0-T2期）扫描图像进行重叠,比较其配准误差.两种重叠方法均由两名操作者重复进行两次.结果 利用上述两种配准方法分别对不同时间点的图像重叠,所得配准误差分别为（0.448±0.074） mm、（0.516±0.094）mm,具有统计学差异.不同操作者重复进行两次,结果无显著性差异.结论 两种方法均具有良好的可靠性,但半表面配准法更准确.

Objective The purposes of this study were to compare the accuracy of two different facial soft tissue three-dimensional superimposition methods and explore their reliability,hence to find appropriate ways for clinical evaluation.Methods Two different superimpositionmethods （Semi-surface superimposition and Point ＋ region composite registration） were used to register the images acquired at T0 （Immediate）,T1 （3 minutes） and T2 （3 days）,which were performed twice by two observers.Results The mean register error of semi-surface superimposition and point ＋ region composite registration methods were （0.448 ± 0.074） and （0.516 ± 0.094） mm respectively and there was significant difference between them.Both methods had good reliabilities.Conclusions Both the Semi-surface registration and Point ＋region composite registration are reliable methods,but the former was more precise.