Patent ID: 7613276

Claim:
A mammography apparatus, comprising: a radiation irradiation section for irradiating radiation on a breast of a subject; an object table having therein an image recording medium that receives the radiation to record image information thereon according to the dose of radiation transmitted through the breast, and a dose detector for detecting the dose of radiation irradiated from the radiation irradiation section and transmitted through the breast; an arm connecting the radiation irradiation section and object table such that they face each other; a compression paddle, disposed between the radiation irradiation section and object table, for compressing the breast onto the object table; an arm rotation means for rotating the arm according to the imaging direction for the breast; a breast size detection means for detecting the size of the breast of the subject; and a dose detecting position changing means for changing the dose detecting position of the dose detector along the side of the object table facing the chest wall of the subject according to the detected size of the breast and the direction of rotation of the arm when rotated by the arm rotation means.