Computed tomography surveillance helps tracking COVID-19 outbreak
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ORIGINAL ARTICLE
Computed tomography surveillance helps tracking COVID‑19 outbreak Akihiro Machitori1 · Tomoyuki Noguchi2,3,4 · Yusuke Kawata1 · Nobuhiko Horioka5 · Akihiro Nishie6 · Daisuke Kakihara6 · Kousei Ishigami6 · Shigeki Aoki7 · Yutaka Imai8 Received: 5 June 2020 / Accepted: 26 July 2020 © Japan Radiological Society 2020
Abstract Purpose To reveal that a computed tomography surveillance program (CT-surveillance) could demonstrate the epidemiologic features of COVID-19 infection and simultaneously investigate the type and frequency of CT findings using clinical CT data. Materials and methods We targeted individuals with possible CT findings of viral pneumonia. Using an online questionnaire, we asked Japanese board-certified radiologists to register their patients’ information including patient age and sex, the CT examination date, the results of PCR test for COVID-19 infection, CT findings, and the postal code of the medical institution that performed the CT. We compared the diurnal patient number and the cumulative regional distribution map of registrations in CT-surveillance to those of the PCR-positive patient surveillance (PCR-surveillance). Results A total of 637 patients was registered from January 1 to April 17, 2020 for CT-surveillance. Their PCR test results were positive (n = 62.5–398%), negative (n = 8.9–57%), unknown (n = 26.2–167%), and other disease (n = 2.4–15%). An age peak at 60–69 years and male dominance were observed in CT-surveillance. The most common CT finding was bilaterally distributed ground-glass opacities. The diurnal number and the cumulative regional distribution map by CT-surveillance showed tendencies that were similar to those revealed by PCR-surveillance. Conclusion Using clinical CT data, CT-surveillance program delineated the epidemiologic features of COVID-19 infection. Keywords COVID-19 · Pneumonia · Viral · Tomography · X-ray computed · Surveys and questionnaires · Public health practice 2
Department of Clinical Research, Center for Clinical Sciences, National Center for Global Health and Medicine, 1‑21‑1 Toyama, Shinjuku‑ku, Tokyo 162‑8655, Japan
3
Department of Radiology, National Hospital Organization Kyushu Medical Center, 1‑8‑1 Jigyohama, Chuo‑ku, Fukuoka City, Fukuoka Province, Japan
4
Department of Clinical Research, National Hospital Organization Kyushu Medical Center, 1‑8‑1 Jigyohama, Chuo‑ku, Fukuoka City, Fukuoka Province 810‑8563, Japan
5
General Affairs Division, Health Policy Bureau, Ministry of Health, Labour and Welfare, 1‑2‑2 Kasumigaseki, Chiyoda‑ku, Tokyo 100‑8916, Japan
6
Shigeki Aoki [email protected]
Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3‑1‑1 Maidashi, Higashi‑ku, Fukuoka City, Fukuoka Province 812‑8582, Japan
7
Yutaka Imai [email protected]‑tokai.ac.jp
Department of Radiology, Juntendo University, 2‑1‑1 Hongo, Bunkyo‑ku, Tokyo 113‑8421, Japan
8
Department of Radiology, Tokai University Hachioji Hospital, 1838 Ishikawa‑cho, Hachioji City, Tokyo 192‑
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