positron-emission tomography

noun

Definition of positron-emission tomography

: tomography in which a cross-sectional image of regional metabolism is obtained by a usually color-coded 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)

Examples of positron-emission tomography in a Sentence

Recent Examples on the Web In the new study, the authors used positron-emission tomography to scan immune system activity in mice that had the blood in a single cerebral artery interrupted for 45 minutes, mimicking an ischemic stroke. Bret Stetka, Scientific American, 2 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'positron-emission tomography.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of positron-emission tomography

1976, in the meaning defined above

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The first known use of positron-emission tomography was in 1976

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positronium

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positure

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Cite this Entry

“Positron-emission tomography.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/positron-emission%20tomography. Accessed 23 Jul. 2021.

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More Definitions for positron-emission tomography

positron-emission tomography

noun

Medical Definition of positron-emission tomography

: tomography in which an in vivo, noninvasive, cross-sectional image of regional metabolism is obtained by a usually color-coded cathode-ray tube 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 abbreviation PET

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