CT carotid and cerebral angiography is used to study the neck arteries (carotid arteries) and brain arteries (cerebral arteries) using a CT scanner. It can detect aneurysms, narrowing of arteries in the brain, abnormal blood vessels, stenosis, and narrowing or blockage of the carotid arteries. The procedure involves inserting a cannula if needed, obtaining plain CT images of the neck and brain, injecting contrast dye using a pressure injector, and obtaining images of the arteries. It can help determine the risk of future strokes and identify issues like strictures of the carotid arteries.