Radiation phase contrast imaging apparatus

A radiation phase contrast imaging apparatus comprising:

• an image signal generation system including an X-ray source and an image signal detector for detecting an image signal based on X-rays irradiated from the X-ray source;
• a plurality of gratings including a first grating to which the X-rays from the X-ray source are irradiated and a second grating arranged between the first grating and the image signal detector;
• a holder extending in an optical axis direction of the X-rays, the holder being configured to hold one of the plurality of gratings and the image signal generation system in a suspended manner;
• and
• a position switching mechanism configured to switch a relative position of the plurality of gratings with respect to the image signal generation system between a retracted position for capturing an absorption image without using the plurality of gratings and a detection position for capturing a phase contrast image using the plurality of gratings,
• wherein either one of the plurality of gratings and the image signal generation system is held by the holder which is single in number.