CT Perfusion is a noninvasive way of determining territory at risk for stroke in patients with vascular disease or vasospasm after subarachnoid hemorrhage. A multi detector CT scanner is needed and intravenous contrast is injected with multiple slices taken through the brain in a sequential fashion over a period of time to evaluate contrast in the arterial and venous circulation. Post processing using sophisticated GE software is employed to determine blood volume, blood flow and mean transit time. This can determine territory at risk for stroke, or see if there is autoregulation and compensation by the body’s own mechanisms. Data is often used to determine need for endarterectomy. Data on patients in the neurosurgical unit may determine a change in blood pressure parameters, or the need for neurovascular intervention.
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