Kim Kee-Deog, Ruprecht Axel, Wang Ge, Lee Jae Bum, Dawson Deborah V, Vannier Michael W
Department of Oral and Maxillofacial Radiology, Oral Science Research Center, College of Dentistry, Human Identification Research Institute, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-752, Republic of Korea.
Forensic Sci Int. 2005 Dec 1;155(1):28-34. doi: 10.1016/j.forsciint.2004.11.004. Epub 2004 Dec 22.
The purpose of this study was to determine the precision and accuracy of facial soft tissue measurement using personal computer (PC)-based multiplanar reconstructed (MPR) computed tomography (CT) images and to evaluate the effect of the various CT scanning protocols on the facial soft tissue thickness measurement. Thirteen different CT imaging protocols were used to image a cadaver head. MPR reformations and three-dimensional (3D) reconstructions viewed on a laptop PC were used to make measurements at six specific sites on each set of images. These measurements were compared to physical measurements at the same sites. Increasing the slice thickness resulted in decreased image quality. Within the same slice thickness, increasing the pitch ratio in the spiral mode, resulted in decreasing image quality. The image quality of conventional CT scanning was relatively poorer than that of the spiral CT scanning. However, the mean deviation from the physical measurement was within 0.43 mm in every instance. This mean deviation was quite small and clinically acceptable for measuring the soft tissue thickness of the facial area. PC-based MPR CT images of the face using routine scanning CT protocols can be used to accurately measure soft tissue thickness in the facial region. However, for more fine and accurate data collection, scanning protocols with slice thicknesses less than 5mm, and a spiral/helical mode pitch less than 2:1 are recommended.
本研究的目的是确定使用基于个人计算机（PC）的多平面重建（MPR）计算机断层扫描（CT）图像测量面部软组织的精度和准确性，并评估各种CT扫描协议对面部软组织厚度测量的影响。使用13种不同的CT成像协议对一具尸体头部进行成像。在笔记本电脑上查看的MPR重建和三维（3D）重建用于在每组图像的六个特定部位进行测量。将这些测量结果与相同部位的物理测量结果进行比较。增加切片厚度会导致图像质量下降。在相同切片厚度下，增加螺旋模式下的螺距比会导致图像质量下降。传统CT扫描的图像质量相对低于螺旋CT扫描。然而，在每种情况下，与物理测量的平均偏差均在0.43毫米以内。这种平均偏差非常小，在临床上可接受用于测量面部区域的软组织厚度。使用常规扫描CT协议的基于PC的面部MPR CT图像可用于准确测量面部区域的软组织厚度。然而，为了收集更精细和准确的数据，建议使用切片厚度小于5毫米且螺旋/螺旋模式螺距小于2:1的扫描协议。
