X-ray imaging system

An X-ray imaging system which estimates an evaluation index used when quality determination of an examined target is performed based on a reconstructed image of the examined target imaged by an X-ray Talbot imaging apparatus, the X-ray imaging system comprising:

• an X-ray Talbot imaging apparatus which includes an X-ray source, a plurality of gratings, and an X-ray detector provided aligned in an X-ray irradiating axis direction, wherein an X-ray is irradiated from the X-ray source through the examined target which is an object and the plurality of gratings and to the X-ray detector to obtain a moire image necessary to generate the reconstructed image of the examined target;
• a controller;
• and
• a first database which shows, for each name or type of material, a correlation between information regarding a signal strength in the reconstructed image generated based on the moire image and quality information of the material included in the examined target,
• wherein the controller estimates as the evaluation index the quality information regarding an area of interest in the examined target from the reconstructed image based on information regarding the input name or the type of material and input shape information and the first database.