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Congress: ECR25
Poster Number: C-11924
Type: Poster: EPOS Radiographer (educational)
DOI: 10.26044/ecr2025/C-11924
Authorblock: T. Asahara1, H. Hayashi2, S. Okada1, C. Yamaguchi1, N. Kimoto3, S. Goto2, R. Nishigami2, Y. Morimitsu1, T. Iguchi1; 1Okayama/JP, 2Kanazawa/JP, 3Fukuoka/JP
Disclosures:
Takashi Asahara: Nothing to disclose
Hiroaki Hayashi: Grant Recipient: JSPS Kakenhi, Japan, 24K03306
Shunsuke Okada: Nothing to disclose
Chihiro Yamaguchi: Nothing to disclose
Natsumi Kimoto: Nothing to disclose
Sota Goto: Nothing to disclose
Rina Nishigami: Nothing to disclose
Yusuke Morimitsu: Nothing to disclose
Toshihiro Iguchi: Nothing to disclose
Keywords: Forensic / Necropsy studies, Radiation physics, Radiographers, CT, CT-Quantitative, Experimental investigations, Physics, Forensics, Image verification
Learning objectives In the field of dental forensic medicine, diagnoses have been made by qualitative exams. As shown in Fig. 1, the identification of unidentified individuals is carried out through direct visual investigation of the oral cavity and analysis of dental X-ray photographs to obtain the necessary information [1], but there are currently no quantitative indicators to support this information. Currently, photon counting CT (PCCT) is developed [2,3], and it is expected that diagnostic accuracy will be improved when quantitative diagnosis such...
Read more Background Fig. 4 explains the conceptual differences between (a) conventional energy integrating detector (EID) and (b) energy resolving photon counting detector (ERPCD). Since EID reads out absorbed energies by the imaging detector at once, it can not perform imaging in which the energy information of each X-ray is used. On the other hand, ERPCD can analyze the energy of each X-ray photon, therefore it can output images based on the X-ray energy [4-6]. [fig 4] The comparison of present and previous studies is shown...
Read more Findings and procedure details Fig. 12 (a) shows the Zeff images of the multi-energy CT phantom obtained by the PCCT and DECT. The Zeff image generated by DECT has been applied a noise reduction filter recommended by the manufacturer, so the noise is relatively lower. The Zeff image obtained by PCCT is a filterless image, and it has the potential to generate an image having smaller noise by applying image processing filters. The quantitative analysis results are shown in Fig. 12 (b), and the...
Read more Conclusion In this study, we proposed an algorithm to generate effective atomic number images using PCCT and demonstrated its application to human identification in forensic dentistry. The systematic uncertainty of our algorithm to derive Zeff images from VMIs was determined to be Zeff +/-0.40. Zeff values of dental materials obtained by PCCT were consistent with those obtained by DECT. Analysis utilizing the Zeff value, which is independent of the imaging device, can provide an important quantitative indicator for the identification and/or...
Read more References Krishan K, Kanchan T, Garg AK. Dental Evidence in Forensic Identification-An Overview, Methodology and Present Status. The Open Dentistry Journal. 2015;9:250–256. Doi: 10.2174/1874210601509010250. McCollough CH, Rajendran K, Leng S, Yu L, Fletcher JG, Stierstorfer K, Flohr TG. The technical development of photon-counting detector CT. European Radiology. 2023;33:5321–5330. Doi: 10.1007/s00330-023-09545-9. Flohr T, Petersilka M, Henning A, Ulzheimer S, Ferda J, Schmidt B. Photon-counting CT review. Physica Medica. 2020;79:126–136. Doi: 10.1016/j.ejmp.2020.10.030. Hayashi H, Kimoto N, Asahara T, Asakawa T, Lee C, Katsumata A. Photon counting...
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