采用95%置信椭圆法测定三维计算机断层扫描图像上颌面解剖标志点的可重复性。
Reproducibility of maxillofacial anatomic landmarks on 3-dimensional computed tomographic images determined with the 95% confidence ellipse method.
作者信息
Muramatsu Atsushi, Nawa Hiroyuki, Kimura Momoko, Yoshida Kazuhito, Maeda Masahito, Katsumata Akitoshi, Ariji Eiichiro, Goto Shigemi
机构信息
Department of Orthodontics, Aichi-Gakuin University School of Dentistry, Nagoya, Japan.
出版信息
Angle Orthod. 2008 May;78(3):396-402. doi: 10.2319/040207-166.1.
OBJECTIVE
To assess the plotting reproducibility of landmarks on 3-dimensional computed tomography (3D-CT) images through use of the 95% confidence ellipse in order to propose sufficiently stable coordinate systems for 3D-CT measurements.
MATERIALS AND METHODS
Six dentists plotted 19 landmarks twice on 3D-CT images. Scatterplots and the 95% ellipses were produced 3-dimensionally, and the areas of the ellipses were calculated for evaluating the reproducibility of landmarks.
RESULTS
The plotting reproducibility of each landmark showed characteristic features. Among five landmarks (the sella [S], nasion [N], basion [Ba], orbitale [Or], and true porion [Po]) that are frequently used as reference points on cephalograms, Ba showed the smallest areas for all three coordinate axes, indicating high reproducibility. The coronoid process (CP) and the tooth-related landmarks showed relatively high reproducibility.
CONCLUSION
Sufficiently stable coordinate axes could be proposed for different treatments and studies.
目的
通过使用95%置信椭圆评估三维计算机断层扫描（3D-CT）图像上标志点的绘图再现性，以便为3D-CT测量提出足够稳定的坐标系。
材料与方法
六名牙医在3D-CT图像上对19个标志点进行了两次绘制。三维生成散点图和95%椭圆，并计算椭圆面积以评估标志点的再现性。
结果
每个标志点的绘图再现性呈现出特征。在头影测量中常用作参考点的五个标志点（蝶鞍[S]、鼻根点[N]、颅底点[Ba]、眶点[Or]和真性耳点[Po]）中，Ba在所有三个坐标轴上的椭圆面积最小，表明再现性高。冠突（CP）和与牙齿相关的标志点显示出相对较高的再现性。
结论
可为不同的治疗和研究提出足够稳定的坐标轴。
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