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Fig 3. A 75-year-old woman with occlusion of the right cervical internal carotid artery (case 12). A, Cervical 3D-CTA showing occlusion of the right internal carotid artery (arrow). Right lateral (left) and left lateral (right) views of the right cervical vessels are shown. CCA, common carotid artery.
B, d3D-CTA (anterosuperior view). 3D-CTA scans were obtained at 12, 12.5, 13, 13.5, 14, and 14.5 seconds after contrast injection. The right middle cerebral artery (MCA, arrowheads) is visualized later (at 13 or 13.5 seconds) than the left MCA (arrows), which appeared at 12.5 seconds. d3D-CTA demonstrates the right MCA with a 0.5- and 1-second filling delay compared with the left MCA. The smaller caliber of the right compared with the left MCA indicates that the blood flow volume in the right MCA is smaller than in the left MCA. Cal, calcification.
C, Functional maps of cerebral blood flow (CBF), cerebral blood volume (CBV), and mean transit time (MTT) produced from d3D-CTA data. The maps showed no significant difference between the 2 hemispheres.
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