VOLKER STEGER / SCIENCE PHOTO LIBRARY VOLKER STEGER / SCIENCE PHOTO LIBRARY
CT scanning. Patient passes into a CT (Computed Tomography or CAT) scanner. The patient is lying on a mobile table, and will pass head-first through the circular scanner. CT scanning involves directing thin beams of X-rays through the patient from the rim of the scanner. The images produced by these beams are combined by a computer to produce cross-sectional "slices" through the body. CT scans produce good contrast between soft tissues and bone, and are useful in diagnosing cancerous tumours and other diseases. Photograph of a research scanner at Siemens Research in Princeton, New Jersey, USA.
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