Brain and arteries. Coloured three-dimensional MRA (magnetic resonance angiography) scan of healthy arteries (red) supplying a human brain (blue) with

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Brain and arteries. Coloured three-dimensional MRA (magnetic resonance angiography) scan of healthy arteries (red) supplying a human brain (blue) with oxygenated blood. The front of the brain is at left. MRA is a magnetic resonance imaging (MRI) technique that highlights blood vessels without the use of X-rays or the need to inject a radio- opaque contrast medium.

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Photo credit: © ZEPHYR/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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