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Brain arteries. Coloured 3D magnetic resonance imaging (MRI) scan of the arteries in the brain of a 27-year-old woman. This view, from above with the front of the head at top, has been obtained by using gadolinium as a contrast medium to show the arteries (pink). The arteries seen here include the carotid arteries of the neck (the largest ones seen here), the basilar trunk and the posterior cerebral arteries (both inside the brain) and the Circle of Willis (just below centre) where the internal neck arteries meet before branching out inside the brain. MRI scanning uses powerful magnets and radio waves to look at structures inside the body.
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