Patent Number: 
Section: claims

1. An X-ray radiographic method for performing an X-ray radiography of a subject, comprising:providing an X-ray radiographic apparatus comprising an X-ray tube, an X-ray detector, a holding member for holding the X-ray tube and the detector, a table top board for supporting the subject, and a filter movement mechanism:radiating X-rays from the X-ray tube to the subject;detecting an X-ray applied to the subject with the X-ray detector;moving at least one of the holding member and the table top board;actuating the movement mechanism to move a filter, which extracts X-ray components radiated from the X-ray tube, outside or inside a radiation field of the X-rays radiated from said X-ray tube so that the filter is moved inside the radiation field only when a relative position between the holding member and the table top board is at a predetermined position, and so that the filter is moved outside the radiation field when the relative position is other than the predetermined position. 2. The X-ray radiographic method according to claim 1, further comprising: switching the filter, which is a currently used filter and is one of a plurality of available filters, with another of the plurality of filters to move the another of the plurality of filters inside the radiation field of X-rays and the currently used filter outside the radiation field of the X-rays.