Patent ID: 7573977

Claim:
A mammographic for taking an image of a breast of a subject, comprising: an X-ray tube for radiating X-rays; an X-ray detector for detecting the X-rays radiated from the X-ray tube and transmitted through the breast; a column; a first support frame arranged, for rotation about a rotary axis, on the column and supporting the X-ray tube; a second support frame arranged, for rotation about the rotary axis, on the column and supporting the X-ray detector; and a mechanism for selectively switching over between a first mode that the second support frame is rotated by a rotation force of the first support frame and a second mode that the first support frame is rotated independently of the second support frame, wherein the mechanism further includes a first motor for rotating the second support frame, a first gear in an arcuate form fixed on the second support frame, a second gear rotatably provided in the first support frame and placed in mesh with the first gear, and a second motor for rotating the second gear.