Prospective evaluation of patients with subarachnoid hemorrhage (SAH) will be done by computed tomography angiography (CTA) and perfusion imaging (CTP) for any correlation between degree of vasospasm and perfusion deficit as well as evaluating the ability of CTP to predict delayed cerebral ischemia.
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Cerebral blood flow (CBF) on Admission
Timeframe: 3 days from the attack
Cerebral blood volume (CBV) on Admission
Timeframe: 3 days from the attack
Mean transit time (MTT) on Admission
Timeframe: 3 days from the attack