计算机辅助颈椎分析系统识别颈椎标志点的准确性和重复性探讨

The accuracy analysis of semiautomatic identification of landmarks using computer aided cervical vertebra analysis

目的:探讨计算机辅助颈椎分析系统(CACVA,Computer Aided Cervical Vertebra Analysis)半自动识别颈椎标志点的准确性及重复性。方法:随机选取口腔正畸门诊青少年患者常规拍摄的X线头颅侧位定位片120张,由专家组、正畸初学者组、计算机辅助颈椎分析组定点第2～5颈椎体的27个标志点,各组分别定点三次,比较三组之间定点的准确性和组内重复性。专家组和初学者组采用手工定点,CACVA组采用快速行进算法和抛物线拟合来分割颈椎图像,通过多段曲线拟合的方法对颈椎骨边缘拟合,进而计算出标记点。随机区组方差分析及两两比较进行三组定点准确性和重复性的比较。结果:从定点准确性来看,CACVA组与专家组差异无显著性(P>0.05),计算机辅助颈椎分析组与初学组、专家组和初学组差异均有显著性(P<0.05);从定点重复性来看,CAVCA组优于专家组和初学组。结论:CAVCA组与专家组手工定点具有同样的准确性,同时具有重复性好,简便快速的优势,值得正畸临床和科研推广。

Objective：To investigate the accuracy and repeatability of semiautomatic identification of landmarks using Computer Aided Cervical Vertebra Analysis（CACVA）.Method：120 adolescents（60 boys,60 girls）aged from 9.1 to 17.2 years old were randomly selected.27 landmarks from the second to fifth Cervical Vertebra were identified by CACVA for three times.A senior expert（SE） and a junior expert（JE） did the same work with manual method,respectively.The identification accuracy and repeatability among CACVA,SE and JE were compared by ANOVA and group pairwise comparison.Result：As for the accuracy,there was no significant difference between CACVA and SE（P 0.05）.However,there was significant difference between CACVA and JE,as well as between SE and JE（P 0.05）.As for the repeatability,CACVA was better than SE and JE.Conclusion：CACVA has similar accuracy,less workload and better repeatability.It has a bright future in orthodontic clinical and scientific research.