¦ ̷ ̷ ̷ ̷ ˌ ̷ ̷ ̷ ̷ ¦ ̷ ̷ ̷ ̷ - noun
: tomography in which an in vivo, noninvasive, cross-sectional image of regional metabolism is obtained by a usually color-coded video representation of the distribution of gamma radiation given off in the collision of electrons in cells with positrons emitted by radionuclides incorporated into metabolic substances that have been administered (as by injection) — abbreviation PET