| 摘要 |
<P>PROBLEM TO BE SOLVED: To increase a spatial resolution and to improve phase recovery accuracy in radiation phase imaging of acquiring phase information of a subject using Fourier transformation and inverse Fourier transformation. <P>SOLUTION: A radiographic system 10 performs Fourier transformation on a radiographic image including a periodic pattern modulated by a subject arranged in a radiation field to acquire a spatial frequency spectrum of the radiographic image, separates a first frequency domain B on a straight line L passing through peak coordinates of a fundamental frequency component 62 of the periodic pattern and a second frequency domain C on either side of the straight line, in a frequency domain A including the fundamental frequency component from the spatial frequency spectrum, combines the first frequency domain, the second frequency domain and a third frequency domain D formed by rotating the second frequency domain by 180° with respect to the peak coordinates and reversing the positive/negative of the phase of the spatial frequency spectrum included there into one frequency domain E, performs inverse Fourier transformation on the combined frequency domain, and generates a phase contrast image. <P>COPYRIGHT: (C)2013,JPO&INPIT |
