CHRIS PRIEST / SCIENCE PHOTO LIBRARY CHRIS PRIEST / SCIENCE PHOTO LIBRARY
Computed tomography (CT) brain scanning, showing scanner and patient in background and radiographers working at the scanner's computer terminal in foreground. An image of the subject's brain appears at right, constructed from data relating to the attenuation of a series of x-ray beams by body tissues, passed through the subject from numerous points around the circular scanner. CT scans display good contrast between soft tissues in the body, differentiating between bone, fat and muscle due to the varying x-ray absorption characteristics of these tissues. Typical applications are in the location of tumours and blood clots.
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