da Silva Nathália Cristine, Barriviera Maurício, Junqueira José Luiz Cintra, Panzarella Francine Kühl, Raitz Ricardo
São Leopoldo Mandic Research Center, Department of Oral Radiology, College of Dentistry, São Paulo, SP, Brazil.
Department of Oral Radiology, College of Dentistry, Catholic University of Brasilia, São Paulo, SP, Brazil.
Imaging Sci Dent. 2017 Mar;47(1):11-15. doi: 10.5624/isd.2017.47.1.11. Epub 2017 Mar 21.
This study was performed to investigate the intra- and inter-observer variability in linear measurements with axial images obtained by PreXion (PreXion Inc., San Mateo, USA) and i-CAT (Imaging Sciences International, Xoran Technologies Inc., Hatfield, USA) CBCT scanners, with different voxel sizes.
A cylindrical object made from nylon with radiopaque markers (phantom) was scanned by i-CAT and PreXion 3D devices. For each axial image, measurements were taken twice in the horizontal (distance A-B) and vertical (distance C-D) directions, randomly, with a one-week interval between measurements, by four oral radiologists with five years or more experience in the use of these measuring tools.
All of the obtained linear measurements had lower values than those of the phantom. The statistical analysis showed high intra- and inter-observer reliability (=0.297). Compared to the real measurements, the measurements obtained using the i-CAT device and PreXion tomography, on average, revealed absolute errors ranging from 0.22 to 0.59 mm and from 0.23 to 0.63 mm, respectively.
It can be concluded that both scanners are accurate, although the linear measurements are underestimations, with no significant differences between the evaluators.
本研究旨在调查使用不同体素大小的PreXion（美国加利福尼亚州圣马特奥市PreXion公司）和i-CAT（美国宾夕法尼亚州哈特菲尔德市Xoran Technologies公司旗下Imaging Sciences International公司）锥形束计算机断层扫描（CBCT）扫描仪获取的轴向图像进行线性测量时，观察者内和观察者间的变异性。
使用i-CAT和PreXion 3D设备扫描一个由尼龙制成并带有不透射线标记物的圆柱形物体（模体）。对于每幅轴向图像，由四位具有五年或以上使用这些测量工具经验的口腔放射科医生在水平方向（距离A - B）和垂直方向（距离C - D）上随机进行两次测量，测量间隔为一周。
所有获得的线性测量值均低于模体的测量值。统计分析显示观察者内和观察者间具有较高的可靠性（=0.297）。与实际测量值相比，使用i-CAT设备和PreXion断层扫描获得的测量值平均绝对误差分别为0.22至0.59毫米和0.23至0.63毫米。
可以得出结论，尽管线性测量值存在低估，但两台扫描仪都很准确，评估者之间没有显著差异。
