beam

(redirected from beams)
Also found in: Dictionary, Thesaurus, Acronyms, Idioms, Encyclopedia, Wikipedia.

BEAM

 
brain electric activity map; trademark name for a map of brainwave activity derived from a computerized enhancement of electroencephalographic records.

beam

 [bēm]
a unidirectional, or approximately unidirectional, emission of electromagnetic radiation or particles.
useful beam in radiology, that part of the primary radiation that is permitted to emerge from the tubehead assembly of an x-ray machine, as limited by the aperture or port and accessory collimating devices.
beam splitter a device that reflects light from the output phosphor of an image intensifier to a photographic recording. Called also image distributor.

beam

(bēm),
1. Any bar the curvature of which changes under load; in dentistry, frequently used instead of "bar."
2. A collimated emission of light or other radiation, such as an x-ray beam.
[O.H.G. Boum]

beam

Etymology: ME, beem, tree
1 a bedframe fitting for pulleys and weights, used in the treatment of patients requiring weight traction. See Balkan traction frame.
2 (in radiology) the primary beam of radiation emitted from the x-ray tube.

BEAM

[bēm, bē′ē′ā′em′]
abbreviation for brain electric activity map.

beam

Drug slang
A regional synonym for cocaine.
 
Radiation oncology
A focused stream of particles or electromagnetic radiation which is focused in a single direction or body region as part of a therapeutic regimen.

BEAM

Abbreviation for:
BCNU, etoposide, cytarabine, melphalan (a chemotherapy regimen)
Biomedical Equipment Assessment & Management (Medspeak-UK)
brain electrical activity mapping

beam

(bēm)
1. Any bar with a curvature that changes under load.
2. dentistry Synonym(s): bar (2) .
3. A collimated emission of light or other radiation, such as an x-ray beam.
[O.H.G. Boum]

beam

(bēm)
1. Any bar the curvature of which changes under load; in dentistry, frequently used instead of "bar."
2. A collimated emission of light or other radiation.
[O.H.G. Boum]

beam,

n a stream or approximately unidirectional emission of electromagnetic radiation or particles.
beam, central,
n the center of the beam of roentgen rays emitted from the tube.
beam, useful,
n the part of the primary radiation that passes through the aperture, cone, or other collimator.

beam

a unidirectional emission of electromagnetic radiation. See also x-ray.

external beam therapy
radiotherapy in which the source is at a distance from the patient, e.g. orthovoltage, cesium-137, cobalt-60 or linear accelerator.
beam limitation
restriction of the divergent beam as it appears from the tube window by a lead plate or cone or a light beam diaphragm located at the window.
primary beam
the radiation beam as it passes through the window of the x-ray tube and before it is modified by extra-tube devices.
References in periodicals archive ?
At present, analysis on the fundamental frequency of pre-stressed concrete beams mostly considers the pre-stress in the beam as the external force of beams.
Jim Beam has introduced all-new global packaging, which will be available in mid-2016.
In the present paper, we investigate the evolution of cos-Gaussian beams in SNN media.
All beams had the same size 150 mm x 150 mm x 700 mm.
Crozier says that the narrowed beam is hundreds of times as intense as comparably thin beams shone through holes.
However, if the material is fully cured at the end of the process line, the product could be tested with a series of sensors that would account for the entire area of the product's surface (100%) by a moving or stationary gantry, with an array of beams each averaging a focal area of an eighth of an inch to a full half inch diameter.
For example, a rustic beam that's simple and has a rough, hand-hewn appearance--such as the beams found in many old farmhouses--conveys a rural feel.
During 3-5 August, large concrete beams had been removed from one end of the bridge.
In revising his well-known study published in 1983, Montaigne, la glose et l'essai, Andre Tournon views the writings on the beams as just one more instance of the enunciation of Montaigne's thought, to be viewed in the global context of the Essais and considered in their various iterations: "Les sentences gravees sur les poutres de la 'librairie' de Montaigne sont isolees .
But it also always fades, making way for the next utterance, in Amodal Suspension, the beams slowly rise into the sky and decrease in intensity while preserving the original rhythm.
Suddenly, the hall goes pitch-black except for four beams of green light that pinpoint each emerging band member.