Fig 1.
Number of devices (1A) and utilizations (1B) of CT, MRI and PET.
The number of utilizations is drawn from September of each year.
Table 1.
Number of devices and utilizations classified by device version.
Fig 2.
Population, population density (2A), number of devices, and number of utilizations of CT (2B), MRI (2C) and PET (2D) in each municipality in 2011.
Quartile points of all values were used as cut-offs for color change except for PET in which quartile points of values excluding zero were used.
Fig 3.
Number of devices of CT (3A), MRI (3B), and PET (3C) per 100,000 population, classified by municipality type.
“Metropolis” includes all the wards (ku) of the ordinance-designated cities (seirei-shitei-toshi), as well as 23 special wards of Tokyo (n = 193). “City” includes the other cities (shi) (n = 752); “town/village” includes towns (cho) and villages (son) (n = 884).
Fig 4.
Number of utilizations of CT (4A), MRI (4B), and PET (4C) per 100,000 population, classified by municipality type.
Fig 5.
Gini coefficient of the number of devices (5A) and utilizations (5B).
Fig 6.
Gini coefficient of the number of older devices (6A) and newer devices (6B).