Diagnosis of stroke with advanced CT and MR imaging

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Abstract
There have been important advances in stroke imaging, including CT perfusion imaging, xenon-CT, CT angiography, MR diffusion imaging, MR perfusion imaging, MR angiography and heamorrhage-sensitive gradient echo MR sequences. The technical priciples and clinical applications of these methods are explained. An emphasis is made on the diagnosis of hyperacute cerebral ischaermia and issues surrounding the differentiation of reversible from irreversible ischaemic damage with modern imaging modalities, which has implications for thrombolytic therapy. This is followed by an overview of the role of imaging in patients with chronic stroke and transient ischaemic attack. In these patients, the diagnostic contribution of MRI in detecting the underlying pathology and the assessment of cerebrovascular reserve with persusion imaging from an important part in the secondary prevention of stroke.

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