Estimated annual numbers of CT examinations and scannings in Japan. The estimated annual number of patients who underwent CT in Japan was approximately 29.9 million. In approximately 50% of these patients, more than two anatomical locations were scanned in one CT session, thus the number of CT examinations was about 45.3 million annually. In addition, approximately 37% of the patients underwent more than two scans of the same anatomical location (for instance, unenhanced and enhanced CT), making the number of scans about 62.5 million annually.
Tsushima et al. BMC Medical Imaging 2010 10:24 doi:10.1186/1471-2342-10-24