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Fig 6. Axial source images of left severe ICA stenosis; small residual lumen with vessel wall plaque and thick calcification on the sides. A, Source axial image with "standard" W : L settings for CTA evaluation (W 750 : L 200). B, Magnified left ICA (W 750 : L 200). C, Magnified with wide window for appropriate visualization and measurement of residual carotid lumen (W 900 : L 275). A wider W : L setting allows conspicuity between the different attenuations of contrast in lumen and calcification along the sides.
