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Learn the different types of scans. Your doctor may throw a lot of technical possibilities at you, so it helps to be somewhat informed before getting stuck in his or her office and getting locked into possibly-expensive tests that you might not want done. Generally, the scans performed will include:
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Computerized tomography (CT). This is a special kind of X-Ray usually used to detect bleeding. The scanner produces slice-like sections of your brain to examine, and might also involve injections of fluid that will illuminate the blood in the images.
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Magnetic resonance imaging (MRI). An MRI generally uses a combination of radio waves that interact within a magnetic field to produce a detailed 2D or 3D version of your brain. Fluid may also be injected to improve the image.
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Cerebrospinal fluid test. Also known as a "spinal tap," this is used in cases in which you've experienced a hemorrhage that isn't showing up on another scan. Despite the gruesome common name, most patients don't experience much discomfort during or following the test.
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Cerebral angiogram. During this test, a thin probe is inserted near your groin and and threaded through your arteries to your brain to inject a dye, which is used to track the flow of blood and check for hemorrhaging. It's the most invasive of the tests, only used when the others don't reveal anything.
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