JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Heart after bypass. Coloured 3-D electron beam tomography (EBT) scan of a heart showing a coronary artery bypass graft. EBT provides clearer and more detailed information about body tissues than CT (computed tomography) scans and reduces the time 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.
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