Radiological image capturing apparatus and radiological image capturing system

A radiological image capturing apparatus for capturing a radiological image of a joint portion, comprising:

• an X ray tube to emit first X rays;
• an element located in a vicinity of the X ray tube, so as to convert the first X rays emitted by the X ray tube to second X rays that are to be emitted from multi radiant sources;
• a subject placing plate to place the joint portion thereon;
• a first diffraction grating and a second diffraction grating, arranged so as to yield a Talbot effect;
• and
• an X ray detector to detect third X rays through the second diffraction grating;
• wherein the X ray tube, the element, the subject placing plate, the first diffraction grating, the second diffraction grating and the X ray detector are arranged in a vertical direction orthogonal to a floor on which the radiological image capturing apparatus is installed;
• wherein positions of the X ray tube, the element, the subject placing plate, the first diffraction grating, the second diffraction grating and the X-ray detector, relative to the joint portion, are kept constant in such a state that they overlap with each other along the vertical direction concerned, during a time when an operation for radiographing the joint portion, placed onto the subject placing plate, is implemented;
• and
• wherein the subject placing plate is disposed at a space located between the element and the first diffraction grating, in such a manner that a radiological technician on the floor can visually recognize a direction of the joint portion with respect to the subject placing plate.