BSIP, LAURENT / SCIENCE PHOTO LIBRARY BSIP, LAURENT / SCIENCE PHOTO LIBRARY
CT scans displayed on a monitor. The scanner itself is seen through the window at upper right. CT (computed tomography) scans take slice images through the body by 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. They are good at differentiating soft tissue from bone, and are also used to image the brain, as seen here.
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