Most of the medical X-ray images for diagnosis are created through absorption contrast imaging. In the absorption contrast imaging, the contrast is defined by differences in attenuation of the intensity of X rays that passed a subject. In contrast, in phase contrast imaging, the contrast is defined by phase shifts in X rays instead of absorption of the X rays.
For example, Patent Literature 1 discloses an X-ray imaging system to create an X-ray image with a high level of visibility through the edge enhancement utilizing the refraction of X rays in a magnified imaging operation. Patent Literature 1 also discloses the superimposition of a phase contrast image on an absorption contrast image.
Patent Literature 2 discloses the creation of a phase contrast image through tomography and the superimposition of the phase contrast image obtained by tomography on an absorption image created through tomography in the field of computerized tomography (CT).
USPTO Backgrounds
USPTO Backgrounds