评估CBCT三维标志点识别的信度研究  

Reliability of CBCT-based 3D Landmarks Identification

作　　者：史建陆[1] 郑鹭艳 杨智惠[1] 金鑫[1] 

机构地区：[1]福建医科大学教学医院.厦门市口腔医院正畸科,福建厦门361003

出　　处：《口腔医学研究》2015年第7期715-718,共4页Journal of Oral Science Research

摘　　要：目的:评估CBCT头颅标志点识别的信度,为将来三维头影测量分析提供参照。方法:对30例正畸患者的CBCT原始数据,5位观察者使用Dolphin 11.5软件对CBCT图像用多平面重建法标定(轴向、矢状向、冠状向联合定点)14个头颅标志点。一位主要观察者重复定点5次,其余4位观察者各3次,每次时间间隔1周。计算每个标志点的每个维度坐标值的ICC(组内相关系数)以评估观察者内部以及观察者之间的定点的信度。结果:对于观察者间ICC,有90.5%标志点识别的ICC大于0.75,64.3%大于0.9,仅有2.4%小于0.45。对于主要观察者内ICC,95.2%标志点识别的ICC大于0.75,88.1%大于0.9,没有标志点识别信度系数小于0.45。结论:结合适宜的标志点定义及良好的定点培训,使用Dolphin软件在CBCT图像上对新定义的标志点进行识别具有极好的信度。Objective： To evaluate the reliability of identification of CBCT--based skull landmarks and to provide reference for the three--dimensional cephalometric analysis in the future. Methods： 30 pretreatment CBCT data were randomly selected from the CBCT database. Dolphin 11.5 was used to identify 14 skull landmarks in the sagit- tal, coronal,and axial slices on 3D images by five observers. A principal observer repeated five times and the other four observers three times within a 1--week interval. Intra--class correlation coefficient （ICC） for the values of the coordinate x, y, z of each landmark was calculated to determine Intra--observer and inter--observer reliability. Re- suits： The ICC was 〉0.90 for 64.3%,〉0.75 for 90.5% ,and≤0.45 for only 2.4% of inter--observer assess- ments. The ICC of the intra--observer assessments was 〉0.90 for 88.1% ,〉0.75 for 95.2% ,and none of intra-- observer ICC was ≤0.45. Conclusion： Using Dolphin software to identify landmarks on CBCT images can offer ex- cellent reliability with appropriate landmark definition and well--trained observers.

关 键 词：CBCT 标志点 信度 头影测量 

分 类 号：R783.5[医药卫生—口腔医学]