WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY
MRI brain scanning. A patient lies in an MRI (Magnetic Resonance Imaging) scanner during a brain scan, while a radiologist examines an image of the patient's brain on a computer screen. MRI scanners can produce an image of a "slice" through the body in any direction. The scanner builds up images from tiny radio signals emitted when the body's hydrogen atoms are made to fall out of magnetic alignment. The technique is particularly good for studying soft tissues like the brain and spinal cord, where tumours show up clearly.
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