CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Patient undergoing a Computed Tomography (CT) scan, as seen from the scanner's control room. A radiographer is seated at the scanner's computer. An image of the patient's head and brain is visible on a TV monitor. A CT image is constructed from the attenuation of a series of X-ray beams by body tissues, passed through the subject from numerous points around the circular scanner (at top left). CT scans give contrast between soft tissues, fat, muscle and bone, due to varying X-ray absorption. CT scanning is useful in the investigation of organ diseases, as well as the location of brain tumours and blood clots.
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