MARK THOMAS / SCIENCE PHOTO LIBRARY MARK THOMAS / SCIENCE PHOTO LIBRARY
CT head scan. Doctor looking at a CT (computed tomography) scan of a human head (blue) on a screen. The patient (centre right), who is being reassured by another doctor, has just been scanned by the large machine around her head. CT scanning is a diagnostic technique in which X- rays are passed through the body at different angles. A computer then produces a cross- sectional image of the tissue, as seen on the screen. Also known as CAT (computed axial tomography) scanning, this technique provides more detail than X-rays used by themselves. It also reduces the amount of dangerous radiation to which the patient is exposed.
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