JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Human neck, coloured 3-D electron beam tomography (EBT) scan. EBT provides clearer and more detailed information about body tissues than CT (computed tomography) scans and reduces the time that patients are exposed to dangerous radiation. EBT involves firing an electron beam against tungsten targets arranged in a 210 degree arc below the patient. These produce X-rays which pass through the patient. A computer is able to produce cross- sectional (slice) images of the body tissues, and 3-D images can be built up by combining many slices. Arteries (red), veins (blue), the jaw (far left), skull (across top) and vertebrae (down centre) are seen.
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