多平面辅助定位法提高颅颌面三维CT测量准确性的研究

目的:建立一种较准确的三维头影测量定点方法,为面部不对称畸形的临床三维测量打下基础。方法:采用螺旋CT系统,对10例面部不对称畸形患者进行全头颅扫描,并进行CT影像三维重建,描绘测量16个相关解剖标志点。采用SAS8.02软件进行直线相关性和零截距直线回归分析,得到各标志点三维坐标的直线相关系数和零截距直线回归系数。结果:16个标志点的48个三维坐标数据的直线相关系数r、零截距直线回归系数b都在0.99000～1.01000以内。结论:本研究采用的三维测量方法具有较高的准确性和可重复性。该套定位要求及标志点,可以为面部不对称患者的硬组织形态特征改变研究提供参考。

A Study of Multi-plane Aided Identifying Landmark on Three-dimensional CT Model

Objective： The purpose of this study was to establish a high-accuracy 3D measurement method for further clinical three-dimensional measurement of facial asymmetry. Methods： Using spiral CT system, 10 cases of facial asymmetry patients were scanned and three-dimensional models were reconstructed. 16 anatomical landmarks were selected on the three-dimensional CT models. SAS 8.02 was used for statistics. Results： Linear correlation coefficient and Zero intercept of the linear regression coefficient of all the 48 3D coordinates of 16 landmarks were within 0.99000- 1.01000. Conclusion： 3D measurement method used in this study has high repeatability, which can be used in three- dimensional measurement on facial asymmetry patient.