Potential for personal identification using the volume of the mastoid air cells extracted from postmortem computed tomographic images |
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| Institution: | 1. Department of Radiology, Department of Medical Technology, Kyushu University Hospital, Fukuoka 812-8582, Japan;2. Department of Forensic Pathology and Sciences, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan;3. Department of Radiological Science, Dongseo University, 47 Jurye-ro, Sasang-gu, Busan 47011, South Korea;4. Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan;1. Department of Anatomy, Catholic Institute for Applied Anatomy, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul 06591, Republic of Korea;2. Division of Forensic Odontology and Disaster Oral Medicine, Department of Forensic Science, Iwate Medical University, 1-1-1, Idaidori, Yahaba-cho, Shiwa-gun, Iwate 028-3694, Japan;1. Research and Education Faculty, Medical Sciences Cluster, Health Service Center, Kochi University, Kochi, Japan;2. National Research Institute of Police Science, Chiba, Japan;1. Department of Forensic Medicine, Saitama Medical University, Saitama, Japan;2. Department of Forensic Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan;3. Tokyo Medical Examiner’s Office, Tokyo, Japan;4. Department of Forensic Medicine, Hirosaki University Graduate School of Medicine, Aomori, Japan;1. Department of Forensic Medicine, Faculty of Medicine, Jagiellonian University Medical College in Kraków Grzegórzecka, 16 31-531 Kraków, Poland;2. Faculty of Health Sciences, Jagiellonian University Medical College in Kraków Piotra Micha?owskiego 12, 31-126 Kraków, Poland;1. University of Goettingen, (Univ.-Prof. Emeritus), Fiorilloweg 1, D – 37075 Goettingen, Germany;2. Department of Diagnostic Radiology I, University Hospital of Goettingen, Robert-Koch-Str. 40, D – 37073 Goettingen, Germany;3. Institute of Forensic Medicine, Justus-Liebig-University Giessen, Frankfurter Str. 58, D – 35392 Giessen, Germany |
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| Abstract: | This study revealed the usefulness of volumetric analysis of mastoid air cells (MACs) extracted from postmortem computed tomography (PMCT) images in characterizing individuals. To characterize deceased persons, the MACs volumes of 61 Japanese PMCT images were measured after thresholding in Hounsfield units and based on the number of voxels on the right and left sides and the voxel size for each person. The volume differences between the right and left MACs and sex were examined. Although there were no obvious volume differences between males and females, the order of sizes on the two sides varied for each person. Moreover, deceased persons could be roughly classified using the total volume of MACs. Deceased persons with similar total volumes could be distinguished further by comparing the ratio of volumes in bilateral MACs. Although the identification process is dependent on samples and different sizes of bilateral MACs, our pilot study indicated that 81.9% (50/61) of deceased persons could be distinguished. In conclusion, volumetric analysis of MACs measured using PMCT imaging has the potential to identify individuals and reduce the number of candidates. |
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| Keywords: | Personal identification Mastoid air cells Postmortem head CT images Positive identification Disaster victim identification |
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