Measurement accuracy of a computer-assisted three-dimensional analysis and a conventional two-dimensional method
Measurement accuracy of a computer-assisted three-dimensional analysis and a conventional two-dimensional method
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DOI：
10.2319/070810-387.1
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发表时间：
2011-05-01
影响因子：
3.4
通讯作者：
Ors, Fatih
中科院分区：
文献类型：
--
作者：
Olmez, Huseyin;Gorgulu, Serkan;Ors, Fatih
目的：为了确定人工测量和头影测量之间的差异，在不同的部分，人类头骨，这是通过使用计算机辅助三维（3D）分析和传统的二维（2D）techniques.材料和方法：测量进行了13个干燥的人类头骨，然后二维头影X线片和三维计算机断层扫描（CT）图像。在拍摄CT图像前，确定解剖标志并用粘土标记，在侧位和额位头颅X线片时，用金属球和金属针标记相同的标志。对手动、侧位/正位头影测量和计算机辅助3D头影测量进行统计学比较。采用单因素方差分析和Tukey Honestly Significant Difference检验比较各组间测量结果。另一方面，传统2D和手动测量之间的差异具有统计学意义。放大倍数最大的是鼻根-门通距离（14.6%），该距离位于头颅侧位片中距离中央X射线束最远的位置（P < .01）。由于同样的原因，观察到最大的扩大（16.2%）在颧上颌缝之间的距离在传统的头颅额位片（P <0.01）。结论：计算机辅助三维头影测量被发现比传统的头影测量更准确。结果表明，三维头影测量结果与手工测量结果一致。此外，放大率和失真可能会限制传统头影测量的结果。（角度正交。2011;81：375-382）。
Objective: To determine the differences between manual and cephalometric measurements on different sections of the human skull, which were obtained using computer-assisted three-dimensional (3D) analysis and conventional two-dimensional (2D) techniques.Materials and Methods: Measurements were carried out on 13 dry human skulls, then 2D cephalograms and 3D computed tomographic (CT) images were obtained. Anatomic landmarks were determined and marked with clay before CT images were taken, and the same landmarks were marked with the help of metallic balls and pins for lateral and frontal cephalograms. Manual, lateral/frontal cephalometric, and computer-assisted 3D cephalometric measurements were compared statistically. One-way analysis of variance and Tukey Honestly Significant Difference tests were used to compare the results among the groups.Results: All measurements were statistically insignificant between the computer-assisted 3D and manual measurements. On the other hand, the differences between the conventional 2D and the manual measurements were statistically significant. The greatest amount of magnification was found at the Nasion-Menton distance (14.6%), which was located at the farthest distance from the central x-ray beam in the lateral cephalogram (P < .01). For the same reason, the greatest enlargement (16.2%) was observed in the distance between the zygomaticomaxillary sutures on the conventional frontal cephalogram (P < .01).Conclusions: The computer-aided 3D cephalometric measurements were found to be more accurate than the conventional cephalometric measurements. The results revealed that 3D cephalometric measurements were consistent with the manual measurements. In addition, the magnification and distortion might limit the results of conventional cephalometric measurements. (Angle Orthod. 2011;81:375-382.)