| 摘要 |
PROBLEM TO BE SOLVED: To suppress leakage of a radiation to a subject P due to expansion of half shadow of the radiation and positional deviation of a radiation irradiation region 13 on a radiation detector 11 due to positional deviation of a radiation generation tube 8 in a mammographic tomography apparatus comprising a gantry 2 having a front plate 7 on which a breast inlet/outlet 17 for putting a breast 15 into/out from a breast storage part 3 is opened, the radiation generation tube 8 and the radiation detector 11 oppositely provided with the breast storage part 3 held therebetween in the gantry 2, and a rotation drive part for rotating the radiation generation tube 8 and the radiation detector 11 at the same angular velocity around a rotation shaft D passing inside the breast storage part 3.SOLUTION: A collimator 12 rotating in synchronization with the radiation generation tube 8 and the radiation detector 11 around the rotation shaft D is provided in a space closer to the breast storage part 3 between the breast storage part 3 and a radiation emission part 10. |
