Patent ID: 11219417

Abstract:
Fifteen radiation tubes are arranged in a radiation source of the mammography apparatus. An irradiation field limiter has a plurality of first irradiation opening portions which are provided in an X direction and each of which is configured by a pair of a first opening and a second opening facing each other in an irradiation direction of radiation and defines an irradiation field of the radiation. The irradiation field limiter includes a first rotating member that is rotated to a first rotation position and a second rotation position about a rotating shaft parallel to the X direction. At the first rotation position and the second rotation position, the first irradiation opening portions which are arranged at an interval of one radiation tube face the radiation tubes in the irradiation direction. The first irradiation opening portions deviate from each other in the X direction. Among 15 radiation tubes, at least some of second radiation tubes, which are other than first radiation tubes facing the first irradiation opening portions at the first rotation position and do not face the first irradiation opening portions, face the first irradiation opening portions at the second rotation position.