颅面部螺旋CT三维线距测量的准确性评价

目的:研究颅面部螺旋CT三维线距测量与实测距离的一致性。方法:选择12个干燥头颅,采用GE公司16层螺旋CT常规扫描后,将头颅数据转至工作站,进行颅颌面三维重建。选择正畸常用的16个颅面骨性解剖标志点,分别使用DisplayTools测量工具和游标卡尺进行20个项目测量。采用SAS9.0统计软件包进行配对t检验,比较螺旋CT三维线距测量与实测距离的一致性。结果:螺旋CT三维线距测量与游标卡尺实测结果相比,P值范围为0.0995～0.9812,所有测量项目均无显著性差异。结论:螺旋CT体绘制图像颅面解剖标志点间线性距离与实测距离具有一致性,螺旋CT三维测量有望替代实际测量,用于头影测量分析。

The accuracy of 3D-CT volume rendering for craniofacial linear measurements

PURPOSE: This study was designed to determine the consistency of craniofacial measurements using spiral computed tomography volume rendering by computer systems and sliding caliper. METHODS: The study population consisted of 12 cadaver heads which were examined with spiral CT. The archived CT data were transferred to a workstation, and 3D-CT volume rendered images were generated using computer graphics tools. Linear measurements (n=20), based upon conventional craniometric anatomical landmarks (n=16) were made, by Display Tools and sliding caliper respectively. The consistency between the two measurements was analyzed by paired t test using SAS9.0 software package. RESULTS: The results demonstrated no statistically significant difference between imaging measurement and physical measurement, P>0.05. CONCLUSIONS: There is significant consistency between spiral CT measurement and physical measurement for craniofacial linear distance. 3D-CT volume rendering images using craniometric measurements can be used for clinical and basic studies in stomatology.