Patent ID: 8831174
Filing Date: 2014-09-09
Classification: A61B,G01N

Abstract:
1. An X-ray imaging apparatus comprising: a diffraction grating for diffracting X-rays from an X-ray source to form an interference pattern wherein dark and light portions are arranged; a shielding grating including a shielding portion shielding a part of the X-rays forming the interference pattern and a transmitting portion transmitting a part of the X-rays forming the interference pattern; an X-ray detector for detecting an intensity distribution of the X-rays transmitted through the shielding grating; an arithmetic operation unit for deriving a phase information of an object based on a detection result of the X-ray detector; and a moving unit for moving the diffraction grating and the shielding grating, wherein the interference pattern and the diffraction grating are capable of being brought into a first relative position such that the shielding portion of the shielding grating shields a half of the light portion of the interference pattern, and a second relative position such that the relative position between the shielding grating and the interference pattern is shifted from the first position by a width of the shielding portion of the shielding grating, in a direction of a period of the shielding grating, wherein the X-ray detector detects a first X-ray intensity distribution while diffraction grating and the shielding grating are moved by the moving unit in the direction of the period of the shielding grating with keeping the first relative position between the interference pattern and the shielding grating, and a second X-ray intensity distribution while diffraction grating and the shielding grating are moved by the moving unit in the direction of the period of the shielding grating with keeping the second relative position between the interference pattern and the shielding grating, and wherein the arithmetic operation unit calculates a phase information of an object based on the first and second X-ray intensity distributions.