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Fig 4. Stenosis of the left ICA. Local signal intensity loss at CE-MRA (A) with distal enhancement, but residual signal intensity is detectable with TOF-MRA (B: TOF-MIP) and CTA (C, "scout" MIP; D, transverse MPR at site of minimal lumen; E, transverse MPR at reference site beyond poststenotic dilation). Signal intensity is fading at the edge of the scan volume (B), leading to artificial lumen reduction on MIP images (B).
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