MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Human head. Coloured magnetic resonance imaging (MRI) scan of a sagittal (profile) section of a healthy human head. The soft tissue of the lips, nose and skin appears dark blue. The jaw can be seen at lower left, with a tooth (pink) visible at lower centre. The curve of the skull is seen at upper right. MRI uses pulses of radio waves to provoke atoms in the body to release signals. The signal strength depends on the type of tissue, so an image can be built up of the internal features. This makes it a very useful tool when trying to diagnose a condition without performing exploratory surgery.
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