Patent ID: 7670049

Claim:
An X-ray radiography apparatus having an X-ray tube, an X-ray detector opposing the X-ray tube for detecting irradiated X-rays from the X-ray tube, and a collimator having an opening which limits a range of X-rays irradiated to the X-ray detector, the X-ray radiography apparatus comprising: an X-ray detector for the X-ray tube position inspection, which detects the X-rays through the collimator from the X-ray tube at two or more different distances from the X-ray tube; calculation means for calculating a position error of the X-ray tube using a difference of a respective X-ray detection position from a plane of rotation detected at the two or more different distances; and adjusting means for adjusting a position of the X-ray tube based on the position error of the X-ray tube calculated by the calculation means.