X线头影测量分析的准确性研究——人工测量误差分析

A study on the accurary of cephalometric measurement:An analysis of traditional measurement errors

目的 :探讨不同测量者之间存在的人工测量误差大小 ,提高测量结果的准确性。方法 :选取 10张已定点的头颅侧位片描图纸 ,由 5位有一定临床经验的正畸医师在一周内完成 17项测量指标 (角度测量 12项 ,线距 5项 ) ,用计算机辅助测量值衡量他们的误差大小。结果 :平均误差大于 0 .5的测量项目有SL、GoGn SN、SE、FMA、FMIA、OP SN、1 1、IMPA、SNA ,其中SL、GoGn SN的平均误差大于 1。结论 :需作辅助线的测量项目误差偏大且有统计学意义 ;角度测量值与线距测量值的误差无显著差异。

砄bjective: To assess interexaminer errors in traditional cephalometric analysis so as to improve the accuracy . Methods : Ten cephalometric radiographs were selected randomly and 12 angular and 5 liner parameters were measured by 5 orthodontists in one week according to the original landmarks. The results were quantified with that of computer based. Results: The mean errors of some measurements were larger than 0.5, such as SL,GoGn SN, SE,FMA,FMIA,OP SN, 1 1 ,IMPA and SNA,while only those of SL and GoGn SN were larger than 1.0. Conclusion: Statistical significant differences are found in the The errors of measurements which need assisted line among the examiners but not found in the errors between angle measurements and liner measurements?