3D-CT Evaluation of Facial Asymmetry

目的：近年来，三维计算机断层扫描（3D-CT）成像已被用于颅面部畸形患者的诊断和手术治疗计划。我们已经开发了一个三维坐标点评价系统的三维CT成像程序，以评估和诊断患者面部asymmetry.STUDY设计：回顾性地选择了16名正常人的CT数据作为对照组，从患者谁接受了CT检查，以诊断条件以外的颌面畸形。在3D-CT图像上定义从正畸颅影测量（头影测量）点修改的解剖标志，并以毫米计算每个点的不对称指数。设计了一个具有基线的图解图表，该基线指示正常受试者的平均不对称指数加上标准差。结果和结论：面部不对称的地形进行了评估。本文所述的3D-CT成像技术是评估面部不对称形态的实用方法。

OBJECTIVE :Recently, three dimensional computed tomography (3D-CT) imaging has been used in the diagnosis and surgical treatment planning of patients with craniofacial deformities. We have developed a 3D-CT imaging procedure for a three-dimensional co-ordinate point evaluation system to assess and diagnose patients with facial asymmetry.STUDY DESIGN :The CT data of sixteen normal subjects was selected retrospectively as the control group from patients who had undergone CT examinations to diagnose conditions other than maxillofacial deformities. Anatomical landmarks modified from orthodontic craniometric (cephalometric) points were defined on 3D-CT images and the asymmetry index of each point was calculated in millimeters. A diagrammatic chart with a baseline indicating the mean asymmetry indices plus the standard deviation in normal subjects was designed. The resulting diagrammatic chart was used to evaluate the degree of deformity in facial asymmetry patients.RESULTS and CONCLUSIONS :The topography of facial asymmetry was assessed. The 3D-CT imaging technique as described herein was a practical method of evaluating the morphology of facial asymmetry.