Radiology - Technology Information Portal
Thursday, 28 March 2024
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Ab-Ac Ac-Ac Ac-Ac Ac-Ad Ad-Ai Al-Al Al-Am An-An An-An An-An An-An An-Ar Ar-As At-At At-Au Ax-Ax
Anion
An anion is a negative charged ion; the atom has more electrons than protons. Anions are attracted from the positively charged anode. This is a basic part for producing radiation in the x-ray tube.
• View DATABASE results for 'Anion' (4).Open this link in a new window.
Anisotropic
Anisotropic (not isotropic) describes different properties in different directions.
• View DATABASE results for 'Anisotropic' (2).Open this link in a new window.
Annihilation
Annihilation in general refers to the transition of a particle and its antiparticle by collision into something different, depending on their energies and based on the conservation of energy and momentum. The electromagnetic radiation emitted is the result of the annihilation (combination and disappearance) of an electron and a positron. Two gamma rays of 0.511 MeV energy, assuming very low-energy particles, are emitted perpendicular to each other.
• View DATABASE results for 'Annihilation' (7).Open this link in a new window.
Annihilation Coincidence Detection
(ACD) Caused by positron decay and positron annihilation two photons are emitted each with an energy of 511 keV in opposite directions. The simultaneous detection of these two photons, by two detectors indicates that a positron annihilation occurred at the line of response (LOR), the path between the two detectors.
In PET imaging the annihilation coincidence detection is used to localize the tracer, e.g. F18.

See also Positron Decay and Electron Positron Annihilation.
• View DATABASE results for 'Annihilation Coincidence Detection' (4).Open this link in a new window.
Annotation
A text annotation is a sequence of characters permanently added to images before storing.
• View DATABASE results for 'Annotation' (3).Open this link in a new window.
Ab-AcAc-AcAc-AcAc-AdAd-AiAl-AlAl-AmAn-AnAn-AnAn-AnAn-AnAn-ArAr-AsAt-AtAt-AuAx-Ax
 
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 [last update: 2023-11-06 02:01:00]