Number of devices of CT (3A), MRI (3B), and PET (3C) per 100,000 population, classified by municipality type.

<p>“Metropolis” includes all the wards (<i>ku</i>) of the ordinance-designated cities (<i>seirei-shitei-toshi</i>), as well as 23 special wards of Tokyo (n = 193). “City” includes the other cities (<i>shi</i>) (n = 752); “town/village” includes towns (<i>cho</i>) and villages (<i>son</i>) (n = 884).