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A contrast material called gadoliniummay be injected into a vein before the scan to help see details better.

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Doctors can use this to help determine which parts of the brain to avoid when planning surgery or radiation therapy.CT angiography (CTA): For this test, you are injected with a contrast material through an IV line while you are in the CT scanner.The scan creates detailed images of the blood vessels in the brain, which can help doctors plan surgery.But they do not image the bones of the skull as well as CT scans and therefore may not show the effects of tumors on the skull.MRI scans use radio waves and strong magnets (instead of x-rays) to make pictures.

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