collimation


collimation
The method, in radiology, of restricting and confining the x-ray beam to a given area and, in nuclear medicine, of restricting the detection of emitted radiations from a given area of interest. [L. collineo, to direct in a straight line]

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col·li·ma·tion (kol″ĭ-maґshən) 1. in microscopy, the process of making light rays parallel; the process of aligning the optical axis of the optical system to the reference mechanical axes or surfaces of the instrument, or the adjustment of two or more optical axes with respect to each other. 2. in radiology, the elimination of the peripheral (more divergent) portion of an x-ray beam by means of metal tubes, cones, or diaphragms interposed in the path of the beam. 3. in nuclear medicine, the use of a perforated absorber to restrict the field of view of a detector and reduce scatter; the use of an absorber with converging or diverging perforations will also change the camera's angle of view.

Medical dictionary. 2011.

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  • collimation — [ kɔlimasjɔ̃ ] n. f. • 1646; du lat. collimare, pour collineare « viser » ♦ Astron. Action d orienter un appareil d optique dans une direction précise. ● collimation nom féminin (latin collimare, pour collineare, viser) Action de viser, d… …   Encyclopédie Universelle

  • Collimation — Col li*ma tion, n. [Cf. F. collimation, fr. a false reading (collimare) for L. collineare to direct in a straight line; col + linea line. Cf. {Collineation}.] The act of collimating; the adjustment of the line of the sights, as the axial line of… …   The Collaborative International Dictionary of English

  • Collimation — (v. lat.), an Winkelmaßinstrumenten die Übereinstimmung des auf der Theilung des Instrumentes abgelesenen u. des durch dieses so gemessenen Winkels mit der wirklichen Größe desselben. Daher Collimationslinie, die gerade Linie, in welcher man mit… …   Pierer's Universal-Lexikon

  • Collimation — Collimation, bei Winkelmaßen die Uebereinstimmung zwischen der Angabe der Theilung des Kreises und der wirklichen Größe des gemessenen Winkels. C.slinie, die Sehlinie, durch die 2 Abschnitte eines Winkelmaßes beim Visiren gedacht; bei Fernröhren… …   Herders Conversations-Lexikon

  • collimation — kolimacija statusas T sritis Standartizacija ir metrologija apibrėžtis Siauro lygiagretaus elektromagnetinių bangų ar dalelių srauto pluošto sudarymas kolimatoriumi. atitikmenys: angl. collimation vok. Kollimation, f rus. коллимация, f pranc.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • collimation — kolimacija statusas T sritis fizika atitikmenys: angl. collimation vok. Kollimation, f rus. коллимация, f pranc. collimation, f …   Fizikos terminų žodynas

  • collimation — (kol li ma sion) s. f. Terme d astronomie. Action de viser, de diriger la vue.    Ligne de collimation, ligne qui passe par l axe optique de la lunette. ÉTYMOLOGIE    Ce mot devrait être rayé du dictionnaire astronomique et remplacé par… …   Dictionnaire de la Langue Française d'Émile Littré

  • collimation — noun see collimate …   New Collegiate Dictionary

  • collimation — See collimate. * * * …   Universalium

  • collimation — noun a) the act of collimating or something collimated b) aligning lenses along line of sight to minimize aberrations See Also: collimate, collimator …   Wiktionary