Shinkawa Norihiro, Hirai Toshinori, Nishii Ryuichi, Yukawa Nobuhiro
Department of Radiology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, 889-1692, Japan.
Department of Diagnostic Imaging Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan.
Jpn J Radiol. 2017 Jun;35(6):303-309. doi: 10.1007/s11604-017-0632-0. Epub 2017 Mar 14.
To determine the feasibility of human identification through the two-dimensional (2D) fusion of postmortem computed tomography (PMCT) and antemortem chest radiography.
The study population consisted of 15 subjects who had undergone chest radiography studies more than 12 months before death. Fused images in which a chest radiograph was fused with a PMCT image were obtained for those subjects using a workstation, and the minimum distance gaps between corresponding anatomical landmarks (located at soft tissue and bone sites) in the images obtained with the two modalities were calculated. For each fused image, the mean of all these minimum distance gaps was recorded as the mean distance gap (MDG). For each subject, the MDG obtained for the same-subject fused image (i.e., where both of the images that were fused derived from that subject) was compared with the MDGs for different-subject fused images (i.e., where only one of the images that were fused derived from that subject; the other image derived from a different subject) in order to determine whether same-subject fused images can be reliably distinguished from different-subject fused images.
The MDGs of the same-subject fused images were found to be significantly smaller than the MDGs of the different-subject fused images (p < 0.01). When bone landmarks were used, the same-subject fused image was found to be the fused image with the lowest MDG for 33.3% of the subjects, the fused image with the lowest or second-lowest MDG for 73.3% of the subjects, and the fused image with the lowest, second-lowest, or third-lowest MDG for 86.7% of the subjects. The application of bone landmarks rather than soft-tissue landmarks made it significantly more likely that, for each subject, the same-subject fused image would have the lowest MDG (or one of the lowest MDGs) of all the fused images compared (p < 0.05).
The 2D fusion of antemortem chest radiography and postmortem CT images may assist in human identification.
通过尸体计算机断层扫描（PMCT）与生前胸部X线摄影的二维（2D）融合来确定人类身份识别的可行性。
研究对象包括15名在死亡前12个月以上接受过胸部X线摄影检查的受试者。使用工作站为这些受试者获取胸部X线照片与PMCT图像融合的融合图像，并计算两种模态获取的图像中相应解剖标志（位于软组织和骨骼部位）之间的最小距离间隙。对于每张融合图像，将所有这些最小距离间隙的平均值记录为平均距离间隙（MDG）。对于每个受试者，将同一受试者融合图像（即融合的两张图像均来自该受试者）获得的MDG与不同受试者融合图像（即融合的两张图像中只有一张来自该受试者，另一张来自不同受试者）的MDG进行比较，以确定同一受试者融合图像是否能与不同受试者融合图像可靠区分。
发现同一受试者融合图像的MDG显著小于不同受试者融合图像的MDG（p < 0.01）。当使用骨骼标志时，对于33.3%的受试者，同一受试者融合图像是MDG最低的融合图像；对于73.3%的受试者，是MDG最低或次低的融合图像；对于86.7%的受试者，是MDG最低、次低或第三低的融合图像。与软组织标志相比，使用骨骼标志使得每个受试者的同一受试者融合图像在所有比较的融合图像中更有可能具有最低的MDG（或最低的MDG之一）（p < 0.05）。
生前胸部X线摄影与尸体CT图像的二维融合可能有助于人类身份识别。
