RADIOGRAPHY SYSTEM AND RADIOGRAPH GENERATION METHOD

摘要

In a radiographic system and a radiographic image generating method that generate a phase contrast image and an absorption image of an subject, the absorption image in which density irregularity is removed or reduced is generated on the basis of a plurality of pieces of image data obtained for generating the phase contrast image. A X-ray imaging system 10 includes a first absorption type grating 31, a second absorption type grating 32 that has a cycle substantially matched with a pattern cycle of a radiographic image formed by radiation that passes through the first absorption type grating and is located at a plurality of different relative positions with respect to the radiographic image, an FPD 30 that detects the radiographic image masked by the second absorption type grating located at each relative position to obtain a plurality of pieces of image data, a phase contrast image generating unit 27 that generates a phase contrast image on the basis of a plurality of pieces of subject image data obtained by the FPD when imaging is performed with an 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 28 that generates an absorption image on the basis of the plurality of pieces of subject image data. Here, the absorption image generating unit performs a shading correction for the absorption image.