Fig. 1

Number of selected imaging devices and examinations in clinical use in Finland. Notes: The values concern combined numbers of devices and examinations in all healthcare sectors (public, private, and occupational). Radiography excludes dental devices and examinations. The number of MRI devices in 2014 and 2016 are unavailable. The number of ultrasound devices is also unavailable. Data on radiography and CT devices are from Radiation and Nuclear Safety Authority [44,45,46,47,48,49,50,51,52,53,54]. Data on MRI devices were received from the Radiation and Nuclear Safety Authority by email. Data on the number of examinations are from Ruonala et al. [55]. The number of MRI and ultrasound examinations are subject to greater survey bias than radiography and CT examinations [56]