• Adam A Dmytriw, Nicholas Hui, Telvinderjit Singh, Damian Nguyen, Nima Omid-Fard, Kevin Phan, and Anish Kapadia.
• Sunnybrook Health Sciences Centre, Department of Medical Imaging, University of Toronto, Toronto, ON, Canada; Neurointervention & Neuroradiology Service, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, United States of America. Electronic address: adam.dmytriw@uhn.ca.
• Clin Imaging. 2021 Mar 1; 71: 52-62.

IntroductionMeta-analyses provide high-level evidence and understanding their trends may provide understanding of the field as a whole. Bibliometric analysis was undertaken to understand research trends in a particular field or subfield and to assess citation as a measure of impact.MethodsAll journals categorised as "Radiology, Nuclear Medicine & Medical Imaging" under the Web of Science subject category were included. After analyzing impact factors of the journals in up to 2018, the top five journals were identified. The retrieved results were ordered by citation count based on Web of Science and Scopus. Specific parameters regarding the title, journal, publication year, authors, country of origin, institution and university, field of study and funding sources were analyzed.ResultsA total of 139 articles were identified. The mean number of citations per article was 25.3 and 22.6 in Scopus and Web of Science respectively, with four articles receiving 100 or more citations. European Radiology had the greatest number of top cited articles (n = 68; 49%). Most number of articles originated from South Korea (n = 60; 43%) and the commonest field of focus with the most common being oncology (n = 51; 27%).ConclusionThe top 5 high impact journals published a large number of meta-analysis and systematic reviews. The greatest number of top-cited articles were from South Korea, shifting away from the United States. Large number of studies focused on oncologic imaging, consistent with recent trends towards development of imaging biomarkers and personalized medicine. Author H index did not predict citation number or density.Copyright © 2020. Published by Elsevier Inc.

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