| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a noiseless and fine phase differential image. <P>SOLUTION: A radiography apparatus includes: an X-ray detector 13 which generates image data by detecting X-rays emitted from an X-ray source and transmitted through a subject H; a grating unit 12 which is arranged between the X-ray source and the X-ray detector; a phase differential image generating unit 40 which generates the phase differential image on the basis of the image data 51 and 52 obtained by the X-ray detector; an unwrapping processing unit 41 which applies unwrapping processing to the phase differential image; a trend removing unit 101 which removes predetermined frequency components from an offset image and a subject image by setting the unwrapping-processed phase differential image, obtained in the state of the presence of the subject, as the offset image and setting the unwrapping-processed phase differential image, obtained by photographing the subject, as the subject image; and an offset removal unit 102 which removes noises except the predetermined frequency components by taking the difference between the offset image and the subject image, from which the predetermined frequency components are removed by the trend removing unit 101. <P>COPYRIGHT: (C)2013,JPO&INPIT |
