X-ray imaging apparatus and x-ray imaging method

Abstract

Provided is an X-ray imaging apparatus that has a calibration function and can understand a three-dimensional position of a treatment tool in real time during a medical operation without rotating a column of an X-ray tube. A calibration member supported by any one of a first column, a second column, or a top plate, is disposed at a predetermined calibration position in a space irradiated with X-rays from a first X-ray tube and a second X-ray tube. A first X-ray image is acquired by irradiating a subject placed on the top plate with the X-rays from the first X-ray tube supported by the first column and detecting the X-rays transmitted through the subject by an X-ray detector disposed in the top plate. A second X-ray image is acquired by irradiating the subject with the X-rays from the second X-ray tube supported by the second column at a position shifted from an optical axis of the first X-ray tube and detecting the X-rays transmitted through the subject by the X-ray detector. A position of an image of the calibration member included in the first X-ray image and a position of an image of the calibration member included in the second X-ray image are used to calculate a three-dimensional position of the calibration member and to obtain a misregistration amount from the calibration position.