COLIN CUTHBERT / SCIENCE PHOTO LIBRARY COLIN CUTHBERT / SCIENCE PHOTO LIBRARY
Dogfish jaw. Magnetic resonance imaging (MRI) scan of a longitudinal section through the jaw of a lesser spotted dogfish (Scyliorhinus canicula). The fish's head is at left. The size of the jaw gives information on its age and intake of diet. MRI is used to study internal structures. It uses a strong magnetic field to produce radio emissions from hydrogen atoms in the body. It can image both bone and soft tissues.
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