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Figure 3　Numbers of RT candidates who passed the national examinations and total numbers of RTs in the workforce by year (1976 to date)Until 1987, the examination was conducted twice a year (spring and fall). Data from 1976 to 1977, from 1978 to 1982, from 1983 to 1985, from 1986 to 1988 were obtained from 1979, 1984, 1987 and 1990 editions, respectively, of the National Examination Questions (Kanehara shuppan). Data from 1989 to the present were obtained from the MHLW website (https://www.mhlw.go.jp/file/05-Shingikai-10801000-Iseikyoku-Soumuka/0000200803.pdf) 1) Sakai T: [History of recognition of the human body]. Iwanami Shoten, 2008. ISBN:9784000054614. 2) Sakai T: [The History of Medicine with Numerous Illustrations]. Igakushoin, 2019. ISBN:9784260034364. 3) Organisation for Economic Co-operation and Develop-50This research did not receive a grant from funding agencies in the public, commercial, or not- for-profit sectors.Author contributionsYS devised the project and the main conceptual ideas. KM and MG collected and analyzed the data regarding the radiologist education. HS and SK proved and interpreted the data. YM performed reference investigations and wrote the first draft. TS provided the data regarding the radiologist schools and refined the manuscript. HD supervised the project. All authors provided critical feedback and helped shape the research. All authors read and approved the final manuscript.Conflict of interest statementThe authors declare that they have no conflicts of interest regarding this review.Referencesment (OECD). Health at a Glace 2017. 4) Yamashita K: [Nihon Hoshasen Gijutushi (1) People/education]. Japanese Journal of Radiological Tech-nology. 1969; 24: 381-402. doi:10.6009/jjrt.KJ00001367572. 5) Inamoto K: Nihon no Rontgenshishoki ni okeru shinji-jitsu Part 1. Japanese Journal of Radiological Tech-nology. 1995; 51: 846-854. doi:10.6009/jjrt.KJ00001352462. 6) Amano R: The daybreak of X-ray studies in Japan. Prehistory in X-ray medical use in Japan: the roles of some physicists. Japanese Journal of Health Physics. 1995; 30: 113-116. doi:10.5453/jhps.30.113. 7) Haga E: [Gunshot wound and X-ray photo]. Juntendo Medical Journal. 1901; M34: 755-761. doi:10.14789/pjmj.M34.755. 8) Tanaka N: [My experience with X-ray examination]. Juntendo Medical Journal. 1906; M39; 75-85. doi:10. 14789/pjmj.M39.75. 9) Otani S: [Kyoto and Shimadzu father and son]. Chem-istry & Education. 1996; 44: 18-19. doi:https://doi.org/ 10.20665/kakyoshi.44.1_18.10) Ueyama M: X-ray lecture records vol. 1 to 3. Shimadzu Corporation, 1923. 11) Saito I: [Education of medical radiological technician]. Medical Education. 1972; 3: 271-273. doi:10.11307/mededjapan1970.3.271.12) Official bulletin. No. 7324. Law No. 226 Radiological X-ray Technologist Act. July 11. (1951). 13) Official bulletin. No. 12429. Radiological Technologist Act. Law No. 226. May 23. (1968). 14) Artico M, Spoletini M, Fumagalli L et al: Egas Moniz: 90 Years (1927-2017) from cerebral angiography. Front Neuroanat 11, 2017:81. doi:10.3389/fnana.2017.00081.15) Foster JH: Arteriography: Cornerstone of vascular surgery. Archives of Surgery. 1974; 109: 605-611. doi: 10.1001/archsurg.1974.01360050003003.Funding