This shows transverse gadolinium-enhanced T1-weighted MR images obtained superior to the carotid artery
bifurcation in a 72-year-old man. L = ICA lumen. (a) Low-signal-intensity calcium (arrow) and lipid core
(arrowheads) can be seen. (b) Note contouring of the ICA. The outer adventitial wall (red), lipid core (blue),
calcification (green), and vessel lumen (purple) are visible.