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Region of interest placement: representative lateral digital subtraction angiography image of a patient with severe carotid atherosclerosis (A) and carotid web (B) with color-coded red region of interest (ROI) distal to the lesion and a second blue ROI placed at the distal common carotid artery bifurcation for calculation of normalized hemodynamic parameters. A normal carotid bifurcation (C) and ROI placement is shown for comparison.
