Fig. 1

Monochromatic and corresponding color-coded images before and after renal artery revascularization. A Selective angiography of the right renal artery demonstrates significant proximal atherosclerotic stenosis. B Corresponding parametric image with TTP values in the predefined regions of interest (ROIs; A = prestenotic, B = intralesional, C = poststenotic, D = segmental artery of first order at the caudal pole, E = apical renal parenchyma, F = renal parenchyma at the level of hilus, G = renal parenchyma at the caudal pole. C After PTA and stent implantation monochromatic DSA does not reveal residual stenosis. D Color-coded summation image with the same ROIs demonstrates accelerated blood flow within the renal artery close to the former stenosis and within the segmental artery of first order at the caudal pole. Warmer color gradient also indicates better blood supply to the kidney