Patent ID: 7726879

Claim:
An X-ray imaging apparatus comprising: a visible light imaging unit adapted to capture an image of a visual field region with visible light; an X-ray irradiation unit adapted to irradiate X-rays; an X-ray imaging unit adapted to receive X-rays irradiated by said X-ray irradiation unit and acquire a radiograph based on the X-rays; a detection unit adapted to detect a region irradiated with the X-rays on the basis of a radiograph acquired by said X-ray imaging unit; a registration unit adapted to register position information of the irradiated region of an image of the visual field region in a still image shooting mode; a detection unit adapted to detect the presence/absence of a relative positional shift between said X-ray irradiation unit and said X-ray imaging unit by comparing position information registered by said registration unit with position information based on an irradiated region of a radiograph acquired during movie shooting of performing X-ray imaging of an object; and an irradiation control unit adapted to control irradiation of the X-rays by said X-ray irradiation unit based on a detection result obtained by said positional shift detection unit.