Abstract
We investigated the current status of screening mammography in Oita and then examined the relationship between mammary gland dose and image quality using a RMI 156 phantom. There was a marked difference of mammary gland dose by a factor of 4.25 among facilities. This difference in dose may be due to differences in the mammography detection system and ages of the women examined. For the film-screen detection system, the image quality increased with increasing dose, whereas this was not the case for the CR system. Our findings suggest that screening mammography should be done using a highly sensitive film-screen detection system and a grid after determining the most suitable tube voltage for each facility.
