| 主权项 |
1. An X-ray mammography system comprising:
an X-ray detecting unit including a detecting portion configured to detect X-rays passed through a breast; and an X-ray generating unit including a transmission type target and an electron emitting source and is configured to radiate X-rays toward the detecting portion, the transmission type target including a target layer having an electron incidence surface, the transmission type target generating X-rays when irradiated with electrons and radiating the X-rays in a direction opposite to the electron incidence surface, and the electron emitting source emitting an electron beam to the target layer, wherein the distance between a normal to the target layer and a distal end is larger than the distance between the normal and a proximal end, where the distal end is an end of an X-ray irradiated region of the detecting portion closer to a chest of a testee, and the proximal end is an end of the X-ray irradiated region far away from the chest of the testee. |
