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FIG 3. Severe stenosis of the left internal carotid artery in a 79-year-old man.
A–D, IADSA image (lateral view) (A); partial MIP image of second-phase (axial) 3D contrast-enhanced MR angiogram (B); partial MIP image of the first-pass (coronal) 3D angiogram (C); source image of the second-phase (axial) 3D angiogram (D). Irregular forms of stenosis are well visualized on axial view; however, coronal view fails to show details of the stenotic lesions, mainly because of low spatial resolution in the anteroposterior direction. A source image of second-phase (axial) 3D angiography clearly shows irregular plaque (arrow, D).
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