Patent ID: 8903042
Filing Date: 2014-12-02
Classification: A61B,G01N

Abstract:
1. A radiographic system comprising: a first grating; a grating pattern that has a cycle substantially matched with a pattern cycle of a radiographic image formed by radiation that passes through the first grating and is located at a plurality of different relative positions with respect to the radiographic image; a radiographic image detector that detects the radiographic image masked by the grating pattern located at each relative position to obtain a plurality of pieces of image data; a phase contrast image generating unit that generates a phase contrast image on the basis of a plurality of pieces of subject image data obtained by the radiographic image detector when imaging is performed with a subject being placed, in an advancing direction of the radiation that passes through the first grating, in front of the first grating or between the first grating and the grating pattern; and an absorption image generating unit that generates an absorption image on the basis of the plurality of pieces of subject image data, a correction data generating unit that generates correction data on the basis of a plurality of pieces of pre-image data obtained by the radiographic image detector when the imaging is performed with the subject being not placed, wherein the correction data generating unit averages, for each corresponding pixel group between the plurality of pieces of pre-image data, signal values thereof to generate the correction data, wherein the absorption image generating unit performs a shading correction for the absorption image using the correction data, and wherein the phase contrast image generating unit performs the shading correction for the plurality of pieces of subject image data using the correction data, and generates the phase contrast image on the basis of the plurality of pieces of corrected subject image data.