===How soon===
According to UK guidelines, imaging should be performed immediately for people with suspected acute stroke if any of the following apply:<ref name=nice>{{cite web|url=https://pathways.nice.org.uk/pathways/stroke/acute-stroke.pdf|title=Acute stroke|website=UK National Institute for Health and Care Excellence (NICE)}} Last updated: 18 December 2018}}</ref>
*Indications for thrombolysis or early anticoagulation treatment
*Current anticoagulant treatment