Patent ID: 7443950

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 a 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 pressing the breast on the object table; an arm rotation means for rotating the arm according to an imaging direction for the breast; a breast size detection means for detecting a size of the breast of the subject; and a relative position changing means for changing a relative position between the radiation irradiation section and the object table along a side of the object table facing a chest wall of the subject according to the detected size of the breast and a direction of rotation of the arm when the arm is rotated by the arm rotation means.