K-edge subtraction imaging for coronary angiography with a compact synchrotron X-ray source
Fig 3
Raw input data (a,b) and processed output image (c) associated with K-edge subtraction (KES) imaging, for a phantom containing aluminum and iodine. (a) Unfiltered reference, (b) iodine- filtered image, and (c) KES image. Both, (a) and (b), still exhibit aluminum overlaying the tube with iodine contrast agent. KES-imaging (for details see text) provides the aluminum-free pure iodine contrast image (c). The ROIs chosen for the calculation of the CNRs of iodine (1) and aluminum (2) are shown in image (a) and (c). The gray scales for the unfiltered and filtered images display the relative intensity / transmission of the X-ray beam, while the gray values in the KES image c show the negative differences in the absorption.