BSIP DPA / SCIENCE PHOTO LIBRARY BSIP DPA / SCIENCE PHOTO LIBRARY
Man about to undergo a computed tomography (CT) scan, showing his head surrounded by the scanner's circular opening. CT scans are made by a computer from data relating to the attenuation of a series of X-ray beams as they pass through various body tissues. The X-ray source & detector moves synchronously around the subject as a series of "slices" is made. CT images reveal details of soft body tissues not seen on conventional, plain X-ray films. Numerous uses include the rapid assessment of head injuries, and aid the diagnosis & treatment of cancer.
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