Click on image to view larger version.
FIG 3. Patient 30, with an 85% stenosis of the left ICA. Dynamic angiograms of the circle of Willis in foot-to-head projections at 60, 100, 140, 220, 300, and 580 ms after labeling in a-f. In a, the right ICA (upper arrow) and basilar artery (lower arrow) fill first. In b, Collateral flow into the left MCA via the left posterior communicating artery and the anterior communicating artery is shown. In d, Left ICA fills. In f, because of the finite length of the labeled bolus, all vessels but the left ICA and MCA contain unlabeled blood at this late phase.
