2022 Volume 40 Issue 3 Pages 144-147
In Part 2, we will explain the method of reconstructing a refraction-contrast CT image from a refraction-contrast image obtained by X-ray Dark-Field Imaging (XDFI). A refraction-contrast image is a brightness representation of the refraction angle of X-rays propagating through a subject, whereas a refraction-contrast CT represents the refractive index distribution of the subject. Generally, obtaining a CT requires a line integral of the subject as a projection, and to reconstruct the refractive index distribution, the refractive angle must be converted to a line integral of the refractive index distribution. In this course, three projection equations that express the relationship between refraction angle and line integral obtained in the past will be introduced, and the CT reconstruction method for each will be explained.
