X-ray imaging device

An X-ray imaging device comprising:

• an X-ray source;
• a detector configured to detect X-rays emitted from the X-ray source;
• a plurality of gratings arranged between the X-ray source and the detector, the plurality of gratings including a first grating configured to be irradiated with X-rays from the X-ray source and a second grating configured to be irradiated with X-rays from the first grating;
• a moving mechanism configured to move a subject or an imaging system along a direction in which the plurality of gratings extends, the imaging system being composed of the X-ray source, the detector, and the plurality of gratings;
• and
• an image processing unit configured to generate a phase-contrast image based on a signal detected by the detector,
• wherein the image processing unit is configured to:
• based on a plurality of images captured by relatively moving the subject and the imaging system and phase information of the Moire fringe generated in the plurality of images, associate a pixel value of each pixel on which a subject appears in the plurality of images with a phase value of a Moire fringe in a corresponding pixel;
• and
• generate the phase-contrast image by aligning a pixel on which the subject appears on the corresponding position in the plurality of images based on position information of the pixel on which the subject appears on the corresponding position in the plurality of images and a pixel value of each pixel associated with the phase value.