Patent ID: 8009797

Claim:
An X-ray imaging apparatus comprising: an X-ray source; a phase grating that transmits X-rays from the X-ray source and forms an interference intensity distribution by a Talbot effect; an absorption grating that partly shields the interference intensity distribution formed by the phase grating and generates a Moiré; a detector that detects an intensity distribution of the Moiré generated by the absorption grating; and an arithmetic unit that images information of a subject from the intensity distribution of the Moiré detected by the detector and outputs the information, wherein the arithmetic unit executes a process including a Fourier transform step of performing Fourier transform for the intensity distribution of the Moiré acquired by the detector and acquiring a spatial frequency spectrum, and a phase retrieval step of separating a spectrum corresponding to a carrier frequency from the spatial frequency spectrum acquired in the Fourier transform step, performing inverse Fourier transform for the separated spectrum, and acquiring a differential phase image.