Arterial spin labeling (ASL), a noncontrast method
of measuring CBF has become feasible in the clinical setting. Serpiginous
high intensity structures (ASL) are seen in the ischemic tissue on ASL, prior studies suggested that ATA may represent collateral flow. On the
other hand, FVHs are related to hemodynamic impairment and represent slow
retrograde flow in leptomeningeal collaterals. Our aim was to compare the consistency
of the occurrence of ATA relative to that of FVH in patients with proximal MCA
occlusion.
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