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Abstract Perfusion CT is a recent CT based imaging modality Used to describe & Evaluate Cerebral perfusion by estimating relative Values Of different cerebral Perfusion Parameters as Cerebral blood Floe , Cerebral blood Volume & mean Transit time. Iodinated Contrast medium is used & Spiral Or multi-sline CT System are Essential For the technique. It is Found to be useful in evaluation of different Cerebral ischemic conditions Including that associated With Stroke as Well as non-strok Conditions. Perfusion CT is helpful in assement of cerebrovascular reserve in Patients With Chronic Cerebral ischemic conditions for Cerebral Vascular bypass Surgery & Patients undergoing temporary balloon Occlusion test as Well as Patients With Symptoms Of Vasospasm after Subarachnoid hemorrhage. Key Words : Perfusion CT, Non-Stroke, Cerebrovascular reserve |