3D-CT Evaluation of Facial Asymmetry

目的：近年来，三维CT成像已被应用于颅面畸形的诊断和外科治疗计划中。我们开发了一种三维坐标点评估系统的3D-CT成像程序，用于评估和诊断面部不对称患者。研究设计：回顾性选择16名正常受试者的CT数据作为对照组，这些患者接受过CT检查，以诊断颌面部畸形以外的其他情况。在3D-CT图像上定义由正畸颅骨测量(头影测量)点修改的解剖标志，并计算每个点的不对称指数(以毫米为单位)。以正常受试者的平均不对称指数加标准差为基线，设计了一张图表。结果与结论：对面部不对称的地形进行了评估。本文描述的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.