Abstract
CT scanning can be expected to provide not only a qualitative diagnosis, but also early disease detection. Accordingly, these advantages from CT screening have an important role in preventive medicine. On the other hand, CT examination unavoidably involves a high dose of radiation exposure. As such exposures would be considered disadvantageous for healthy individuals who are recommended to receive annual CT screenings, the dose of radiation is expected to be kept to the minimum essential level. On the subject of radiation dose control, this paper reports on the trends, standards, operations and applications, how the CT screening quality control system is integrated within the practice, and efforts made in Japan and the United States.
