PETER BOWATER / SCIENCE PHOTO LIBRARY PETER BOWATER / SCIENCE PHOTO LIBRARY
CT scans being studied by a radiologist. CT (computed tomography) scans take slice images through the body using pulses of X-rays fired from different angles. A computer then builds the resulting images into a scan of a single layer. CT scans are widely used to locate tumours in the body, and for imaging the brain as seen here.
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