How well does the Oxfordshire Community Stroke Project classification predict the site and size of infarct of brain imaging?

Brain CT is therefore essential to determine the site and size of infarcts in all patients with acute stroke in whom further investigations are to be performed-that is, carotid scanning; the decision on whether or not to investigate carotid circulation should depend on the collective information obtained from CT and clinical examination. [...]they raise the issue of whether the investigation and management of patients with acute ischaemic stroke should depend on clinical assessmentor on CT findings.