| AF | abnormal frequency; acid-fast; adult female; afebrile; aflatoxin; albumin-free; albumose-free; aldeh... |
|---|---|
| AT | abdominal thrusts; achievement test; Achilles tendon; Achard-Thiers [syndrome]; adaptive thermogenes... |
| BUA | blood uric acid; broadband ultrasonic attenuation |
| CT | calcitonin; calf testis; cardiac tamponade; cardiothoracic [ratio]; carotid tracing; carpal tunnel; ... |
| m/r | mass attenuation coefficient |
| AC | Attenuation-corrected |
|---|---|
| BUA | Broadband UI-trasound Attenuation |
| BUA | Broadband ultrasonic attenuation |
| LAA | Low attenuation areas |
| ATT | attenuation |
| attenuation | <radiobiology> Process by which a beam of radiation is reduced in intensity when passing through material - combination of absorption and scattering processes, leading to a decrease in flux density of beam when projected through matter. (16 Dec 1997) |
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| attenuation coefficient | 1. <radiobiology> Compton: The fractional number of photons removed from a beam of radiation per unit thickness of material through which it is passing as a result of Compton effect interactions. 2. Linear: The fractional number of photons removed from a beam of radiation per unit thickness of material through which it is passing due to all absorption and scattering processes. 3. Pair Production: That fractional decrease in the intensity of a beam of ionising radiation due to pair production in a medium through which it passes. 4. Photoelectric Effect: That fractional decrease in the intensity of a beam of ionising radiation due to photoelectric effect in a medium through which it passes. (16 Dec 1997) |
| attenuation compensation | In ultrasonography, an increase in receiver gain with time to compensate for loss in echo amplitude with depth, usually due to attenuation. Synonym: attenuation compensation, depth compensation, time compensation gain, time-compensated gain, time-varied gain control, time-varied gain. (05 Mar 2000) |
| attenuation factor | <radiobiology> A measure of the opacity of a layer of material for radiation transversing it, the ratio of the incident intensity to the transmitted intensity. It is equal to Io/I, where Io and I are the intensities of the incident and emergent radiation, respectively. In the usual sense of exponential absorption (I = Ioe- m x), the attenuation factor is e- m x, where x is the thickness of the material and m is the absorption coefficient. (16 Dec 1997) |
| mass attenuation coefficient | <physics> The mass attenuation coefficient, u/p, of a material for uncharged ionising particles is the quotient of DN/N by pdl, where DN/N is the fraction of particles that experience interactions in traversing a distance dl in a material of density p. (16 Dec 1997) |
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| attenuation |
weakening in force or intensity; "attenuation in the volume of the sound" the property of something that has been weakened or reduced in thickness or density
Ãâó: wordnet.princeton.edu/perl/webwn
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| attenuation coefficient |
(Also called extinction coefficient, especially in reference to optical frequencies.) For radiation propagating through a medium, the fractional depletion of radiance per unit pathlength, or in radar usage, of the power density of plane-wave radiation per unit pathlength. The attenuation coefficient is defined through Bouguer's law as where L is the monochromatic radiance at a given wavelength, is the attenuation coefficient, and ds is a differential increment of pathlength. ...
Ãâó: amsglossary.allenpress.com/glossary/browse
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| attenuation |
Blocking or modulation of the excitation light intensity can be accomplished with a series of filters that transmit increasing percentages of the incident light or with an acousto-optic tunable filter (see AOTF).
Ãâó: www.nature.com/focus/cellbioimaging/glossary/
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| attenuation |
Any process in which the flux density (power) of a beam of energy is dissipated.
Ãâó: www.srh.weather.gov/srh/jetstream/append/glossary_...
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| attenuation |
In physics, any process in which the flux density (or power, amplitude, intensity, illuminance, etc.) of a "parallel beam" of energy decreases with increasing distance from the source. Attenuation is always due to the action of the transmitting medium itself, mainly by absorption and scattering. In meteorological optics, the attenuation of light is termed extinction.
Ãâó: www.novalynx.com/glossary.html
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| attenuation | the property of something that has been weakened or reduced in thickness or density |
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| attenuation | weakening in force or intensity |
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