Comparison and reproducibility of 2 regions of reference for maxillary regional registration with cone-beam computed tomography.
Comparison and reproducibility of 2 regions of reference for maxillary regional registration with cone-beam computed tomography.
复制标题
DOI：
10.1016/j.ajodo.2015.09.026
复制
发表时间：
2016-04
期刊：
影响因子：
--
通讯作者：
Cevidanes LH
中科院分区：
文献类型：
--
作者：
Ruellas AC;Huanca Ghislanzoni LT;Gomes MR;Danesi C;Lione R;Nguyen T;McNamara JA Jr;Cozza P;Franchi L;Cevidanes LH
本研究的目的是评估基于上颌体素的配准的两个区域之间的差异并测试配准的再现性。为 16 名成长中的受试者在治疗前 (T1) 和治疗后 (T2) 锥束 CT 建立 3D 模型。在上颌骨的所有 T2 模型中标记了地标，并由两名观察者在两个不同的时间、使用两个不同的参考区域独立执行基于体素的配准：1) 上颌区域 (MAX) 包括在牙槽突下方、在穿过右眼眶点和左眼眶点的平面上方、在穿过眼眶点的颧突处横向修剪的上颌骨，以及 向后位于穿过第二磨牙远侧表面的平面处。 2）腭和颧下区（PIZ）具有不同的后限和前限（分别在通过第一磨牙远端和尖牙远端的平面上）。通过比较 T2 配准模型中相应地标之间的距离并比较相应地标的相应 x、y、z 坐标来测量配准区域之间的差异。通过评估地标之间距离的平均值和标准差并测试相应地标坐标之间的一致性（ICC 和 Bland-Altman 方法），对 T2 表面模型之间的差异进行统计分析。对于所有参考区域、配准次数和观察者组合，从 PIZ 到 MAX 3D T2 表面模型的地标之间的差异均值小于 0.5 mm。 ICC 和 Bland-Altman 图显示出足够的一致性。区域上颌配准的两个区域（MAX 和 PIZ）显示出相似的结果以及足够的观察者内和观察者间再现性。
the aim of this study was to evaluate the differences between 2 regions of maxillary voxel-based registration and to test the reproducibility of the registration. 3D models were built for before treatment (T1) and after treatment (T2) Cone Beam CTs for 16 growing subjects. Landmarks were labeled in all T2 models of the maxilla, and voxel-based registration was performed independently by two observers, at two different times, using two different reference regions: 1) the Maxilla region (MAX) included the maxillary bone clipped inferiorly at the dentoalveolar processes, superiorly at the plane passing through the right and left orbitale points, laterally at the zygomatic processes through the orbitale point, and posteriorly at a plane passing through the distal surface of the second molars. 2) the Palate and Infra-zygomatic region (PIZ) had different posterior and anterior limits (at the plane passing through the distal of the first molar and distal of the canines, respectively). The differences between the registration regions were measured by comparing the distances between corresponding landmarks in the T2 registered models and comparing corresponding x,y,z coordinates from corresponding landmarks. Statistical analysis of the differences between T2 surface models was performed by evaluating the means and standard deviations of the distances between landmarks and by testing the agreement between coordinates from corresponding landmarks (ICC and Bland-Altman method). The means of the differences between landmarks from PIZ to MAX 3D T2 surface models for all of the regions of reference, times of registrations and observers combinations were smaller than 0.5 mm. The ICC and the Bland-Altman plots indicated adequate concordance. Both regions of regional maxillary registration (MAX and PIZ) showed similar results and adequate intra- and inter-observer reproducibility.