High Contrast X Ray Image. Focal spot film distance ffd also known as frd focal to receptor distance. The penetration and the resulting contrast of a specific object or structure in the body generally depends on the photon energy spectrum.
Phase contrast x ray imaging pci or phase sensitive x ray imaging is a general term for different technical methods that use information concerning changes in the phase of an x ray beam that passes through an object in order to create its images. Radiographic contrast is the density difference between neighboring regions on a plain radiograph. Simulated image contrast with fat muscle and iodinated contrast in a vessel.
Contrast is the difference in the displayed or image signal intensity between two areas of interest e g.
X ray enhancement based on component attenuation contrast adjustment and image fusion abstract. As the photon energy decreases the differential attenuation between the lesion and surrounding tissues increases. Simulated image contrast with fat muscle and iodinated contrast in a vessel. This contrast does not take into account the effects of scatter.
