X-ray imaging apparatus and x-ray imaging method

An X-ray imaging apparatus comprising:

• a top plate on which a subject is placed;
• a first X-ray tube that irradiates the subject with X-rays;
• a first support portion that supports the first X-ray tube;
• a second X-ray tube that irradiates the subject with X-rays;
• a second support portion that supports the second X-ray tube;
• an X-ray detector that detects the X-rays that are applied from the first X-ray tube and the second X-ray tube and are transmitted through the subject;
• and
• a processor configured to acquire a first X-ray image from output of the X-ray detector that has detected the X-rays applied from the first X-ray tube, acquires a second X-ray image from output of the X-ray detector that has detected the X-rays applied from the second X-ray tube, and uses a position of an image of a predetermined feature part included in the first X-ray image and a position of an image of the feature part included in the second X-ray image to calculate a three-dimensional position of the image of the predetermined feature part, and
• the second support portion includes a mechanism that supports the second X-ray tube in a rotationally movable manner along a circular orbit about an axis connecting the first X-ray tube and the top plate, wherein
• the second support portion includes a mechanism unit that changes a radius of the circular orbit, and
• a maximum irradiation region of the X-rays from the second X-ray tube to the X-ray detector is smaller than a maximum irradiation region of the X-rays from the first X-ray tube to the X-ray detector.