X-ray positioning apparatus, X-ray positioning method, and attentional image photographing method

An X-ray positioning method in which a patient platform is controlled by use of an X-ray image so as to position a diseased site of a patient at a radiation irradiation position planned in a treatment plan, the X-ray positioning method comprising:

• a positioning image data generation procedure, executed by an X-ray video device, in which there is obtained, by a receiving device of the X-ray video device, first X-ray image data outputted from an X-ray detector for detecting an X-ray radiated by an X-ray tube and stored in a built-in memory of said X-ray video device, and there is generated second X-ray image data in which a respiratory signal related to respiration of the patient and the first X-ray image data are related to each other;
• a patient platform control data generation procedure, executed by a positioning computer, in which a diseased site in the second X-ray image data is compared with a diseased site in a reference image, which is a positioning reference, a postural correction amount is calculated in such a way that an actual posture coincides with the posture in the treatment plan, and then patient platform control data for controlling the patient platform is generated;
• and
• a trigger generation procedure, in which a trigger signal for radiating X-rays in accordance with two or more frame rates is generated based on the respiratory signal and a frame rate control signal including photographing conditions for consecutively photographed images in the first X-ray image data,
• wherein in the trigger generation procedure, the trigger signal is generated in accordance with a first frame rate and a second frame rate that is higher than the first frame rate, and
• wherein in the patient platform control data generation procedure, the patient platform control data is generated, based on the reference image and one X-ray image selected from the consecutively photographed images, in the second X-ray image data, that are photographed at the second frame rate.