Ahn Jaemyung, Hong Jongrak
Department of Oral and Maxillofacial Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.
J Craniofac Surg. 2017 Jan;28(1):e101-e104. doi: 10.1097/SCS.0000000000003288.
In orthognathic surgery, three-dimensional (3D) program-based analysis of 3D reconstructions of computed tomography (CT) images is commonly used, and images viewed on a monitor. The authors compared the coordinates of facial landmarks on images in a 3D program displayed on a two-dimensional (2D) (standard) or 3D monitor. Facial bone CT data from 30 patients were reconstructed in 3D. Four researchers identified 33 facial landmarks, 3 times each on 2D and 3D monitors, for each patient, by their x-, y-, and z-coordinates. The time taken to complete these identifications was measured.For each set of coordinates, the average intraclass coefficient was >0.8 for 2D and 3D analyses, as well as among 4 readers. It took on average of 2 minutes 46 seconds to identify the landmarks on the 2D monitor, compared with 2 minutes 25 seconds on the 3D monitor. The variance of individual coordinates differed when measured on 2D or 3D monitor. The landmarks affected were located near the median region of the facial area, and are important for setting the reference sagittal plane during diagnosis for orthognathic surgery. Therefore, identifying facial landmarks using 3D monitors may be helpful for conducting accurate facial diagnoses.
在正颌外科手术中，通常使用基于三维（3D）程序对计算机断层扫描（CT）图像进行三维重建分析，并在显示器上查看图像。作者比较了在二维（2D）（标准）或三维显示器上显示的3D程序中的图像上面部标志点的坐标。对30例患者的面部骨CT数据进行了三维重建。四名研究人员为每位患者在2D和3D显示器上各识别33个面部标志点3次，记录其x、y和z坐标。测量完成这些识别所需的时间。对于每组坐标，2D和3D分析以及4名读者之间的平均组内相关系数均>0.8。在2D显示器上识别标志点平均用时2分46秒，而在3D显示器上为2分25秒。在2D或3D显示器上测量时，各个坐标的方差有所不同。受影响的标志点位于面部区域的中线附近，对于正颌外科手术诊断期间设置矢状面参考很重要。因此，使用3D显示器识别面部标志点可能有助于进行准确的面部诊断。
