positron emission

positron emission
a form of radioactive decay in which a positron (β+) and neutrino are ejected from the nucleus as a proton is transformed into a neutron. Collision of the positron with an electron causes annihilation of both particles and conversion of their masses into energy in the form of two 0.511 MeV gamma rays.

Medical dictionary. 2011.

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  • Positron emission — is a type of beta decay, sometimes referred to as beta plus ( beta;+). In beta plus decay, a proton is converted, via the weak force, to a neutron, a positron (also known as the beta plus particle , the antimatter counterpart of an electron), and …   Wikipedia

  • positron emission — pozitroninis spinduliavimas statusas T sritis fizika atitikmenys: angl. positron emission; positron radiation vok. Positronenemission, f; Positronenstrahlung, f rus. испускание позитронов, n; позитронное излучение, n pranc. émission des positrons …   Fizikos terminų žodynas

  • positron emission — pozitronų emisija statusas T sritis fizika atitikmenys: angl. positron emission vok. Positronenemission, f rus. испускание позитронов, n pranc. émission de positrons, f …   Fizikos terminų žodynas

  • Positron emission tomography — (PET) is a nuclear medicine imaging technique which produces a three dimensional image or map of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron emitting radionuclide (tracer), which is… …   Wikipedia

  • positron-emission tomography — n tomography in which an in vivo, noninvasive, cross sectional image of regional metabolism is obtained by a usu. color coded cathode ray tube representation of the distribution of gamma radiation given off in the collision of electrons in cells… …   Medical dictionary

  • Positron Emission Tomography — Tomographie par émission de positons Pour les articles homonymes, voir TEP. Reconstruction tridimensionnelle de la distribution de glucose marqué au fluor 18 telle que mesurée par tomographie d émission de positons La tomographie …   Wikipédia en Français

  • positron emission tomography — (PET, positron emission computed tomography, PECT) a technique in nuclear medicine for cross sectional imaging that enables a noninvasive assessment and localization of metabolic activity to be made. Emission of a positron by a radioisotope… …   Medical dictionary

  • positron emission tomography scanner — noun a tomograph that produces cross sectional X rays of metabolic processes in the body • Syn: ↑PET scanner • Hypernyms: ↑tomograph * * * positron emission tomography scanner ● positron …   Useful english dictionary

  • positron emission tomography — pozitroninė tomografija statusas T sritis Standartizacija ir metrologija apibrėžtis Tomografija, kai įvairiomis kryptimis užregistruota pozitronų ir elektronų susidūrimo sukelta gama spinduliuotė apdorojama kompiuterinėmis programomis taip, kad… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • positron emission tomography — noun using a computerized radiographic technique to examine the metabolic activity in various tissues (especially in the brain) • Syn: ↑PET • Hypernyms: ↑imaging, ↑tomography * * * the process of producing a PET scan. Cf. PET scanner. * * *… …   Useful english dictionary

  • positron emission computed tomography — see positron emission tomography …   Medical dictionary

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