Patent ID: 7003069

Claim:
A radiographic apparatus comprising: an X-ray generator operable to irradiate X-rays at a subject; a rotating unit operable to rotate the subject irradiated with the X-rays; a two-dimensional detector converting the X-rays transmitting through the subject to obtain projection-image data; an information extracting unit extracting information including information regarding the subject from the projection-image data; a calculating unit calculating an amount of shift, with respect to a vertical direction, of at least one of the X-ray generator, the two-dimensional detector, and the subject, based on the information extracted by the information extracting unit; a driving unit changing a position, with respect to the vertical direction, of at least one of the X-ray generator, the two-dimensional detector, and the subject; and a controlling unit controlling the driving unit according to the amount of shift calculated by the calculating unit.