SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Leg arteries. Coloured magnetic resonance imaging (MRI) scan of normal arteries (red) of the human legs, seen from the front. MRI scanning uses powerful magnets and radio waves to look at structures inside the body. In addition, a contrast medium has been injected into the blood to highlight the blood vessels, a technique known as angiography.
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