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That just excludes haemorrhagic stroke rather than confirms most ischaemic strokes. It allows for antiplatlets to be safely given. MRI is still needed to diagnose all but severe or very late strokes as far as I’m aware (although this is not my field. Happy to be proven wrong)

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CT is often done both as a non-contrast study (to exclude hemorrhage or large established stroke) and also as a CTA and sometimes with perfusion. This data at most stroke centers is all that is needed acutely to decide whether and how to treat, and MRI is often not done until days later to evaluate final extent of the stroke.

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