Figure 1.
Carotid plaque imaging markers. Stenosis was measured using percent diameter stenosis [(a−b)/a] and mm stenosis (b) (1A). The presence of ulceration was determined on contrast MRA images using a 2mm measurement threshold (1B). Intraluminal thrombus was defined as a filling defect on contrast MRA images (1C). IPH was defined by MPRAGE-positive plaque, using a signal threshold of 2-fold signal intensity over adjacent sternocleidomastoid muscle (1D, right carotid is MPRAGE-positive, image left). Maximum plaque thickness was measured in the transverse plane on 3D MPRAGE images (1D).