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A 70-year-old male patient with hemiplegia. Severe stenosis (70%–99%) of the left internal carotid artery (arrow) shown by volume rendering (a) and sagittal image (b). The measurements of mean attenuation values reveal a 34 HU difference between common carotid artery (c) and internal carotid artery (d). The TAD ratio was calculated as 10.7 (315-281/315×100 = 10.7).
