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Study design diagram. ASPECTS, Alberta Stroke Program Early CT score; CTA, computed tomography angiography; CTP, computed tomography perfusion imaging; DWI, diffusion-weighted imaging; FLAIR, fluid attenuated inversion recovery; FR, Flow Restoration; GRE, gradient refocused echo; IV, intravenous; MRA, magnetic resonance angiography; MRI, magnetic resonance imaging; NCCT, non-contrast CT; PWI, perfusion weighted imaging; tPA, tissue plasminogen activator.
