Dictionary  PET' scan"nera tomographic imaging device that yields visual information about the ongoing activity of the brain: positron-emitting isotopes, incorporated into biologically important compounds, are injected intravenously or administered by inhalation, and the resultant gamma radiation is sensed by detectors and converted into computer-generated images of blood flow, oxygen utilization, glucose uptake, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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