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, "New Method for Tackling Stroke Restrains an Overactive Immune System," 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

Keep scrolling for more

Learn More about positron-emission tomography

Time Traveler for positron-emission tomography

Time Traveler

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

See more words from the same year

Statistics for positron-emission tomography

Cite this Entry

“Positron-emission tomography.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/positron-emission%20tomography. Accessed 15 Aug. 2020.

Keep scrolling for more

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

Comments on positron-emission tomography

What made you want to look up positron-emission tomography? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Name That Thing: Animal Edition

  • alt 5a023732e6f75
  • Name that animal:
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Add Diction

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!