Abstract
This paper described the outline of ACR-DIR (American College of Radiology-Dose Index Registry) currently performed in the U.S. as dose management of CT. And, the effective practical use method and problem were clarified based on trial experience of ACR-DIR software about the present condition of DIR in Japan. Moreover, the CADI (Combined Application Dose Index) system under present development was explained. The CADI system has not only a dose management function but the image quality management function. Through the Great East Japan Earthquake, many people are afraid of radiation and radioactivity, and are increasing uneasiness. The analysis of big data is effectively utilized in various scenes. However, if there is no history of big data, i.e., medical radiation dose, nothing will start. We would like to align with the framework of international community and to hope establishment of the DIR system in Japan, and also NRDR (National Radiology Data Registry)
