Figure 3
From: K-edge Subtraction Computed Tomography with a Compact Synchrotron X-ray Source
Reconstructed CT slices of porcine kidney with kidney stone (indicated by the red arrow) in transverse slice orientation (slice thickness: 70 µm). (a) Unfiltered CT slice, where both the blood vessels (indicated by the yellow arrows) and the kidney stone are visible; (b) iodine filtered CT slice, where the attenuation of the iodine in the blood vessels is reduced, yet it is not possible to distinguish the two materials; (c) in the KES image only structures containing iodine contrast agent stay visible, the kidney stone is eliminated from the image; (d) when performing inverse KES, the iodine is inverted so that the kidney stone can be clearly identified. The gray scales of the unfiltered and filtered CT slices show the absorption values in 1/mm whilst the KES slices show the differences in absorption.
