Figure 1
From: Dynamic K-edge Subtraction Fluoroscopy at a Compact Inverse-Compton Synchrotron X-ray Source
Unfiltered, conventional temporal subtraction and K-edge subtraction (KES) images of an ex vivo mouse, in which iodine contrast agent has been injected at time point t0 in the abdominal peritoneal region. In the conventional fluoroscopic X-ray image the contrast between contrast agent and surrounding bone and tissue is compromised. Both KES and conventional temporal subtraction are able to remove surrounding tissue and bone structures, yet conventional temporal subtraction is prone to artefacts, when there is sample movement between the images that are being subtracted. In this case the movement was simulated by shifting the images with a sinusoidal function continuously to the left and right. The gray scales for the unfiltered images display the relative intensity/transmission of the X-ray beam, while the gray values in the KES and conventional temporal subtraction images show the negative differences in the absorption Δ(μd) with μ being the mean absorption coefficient of the sample in one pixel and d being the thickness of the sample.
