SUMMARY
In patients with acute ischemic stroke, leptomeningeal collateral blood flow potentially maintains blood supply to the ischemic region until the occluded vessel is revascularized. A recent study suggested that MR perfusion allows for the quantitative assessment of collateral status with a high agreement with a DSA-based collateral score. In that study, perfusion parameters, such as the time delay of the tissue residue function and the corresponding blood volume, were combined to determine a perfusion collateral index. A study on MR perfusion-based collateral assessment suggests that an arterial time A study on MR perfusion-based collateral . . .
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