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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 classic literature ?
only one-third in weight was stowed "above the beams," we had a lively time of it.
7000 feet, dipping our beam to an incoming Washington packet.
They'll hide among the roof beams," said Strickland.
Away up the side of the North Mountain his little pine-log shanty projected from its single pane of glass a long, thin beam of light, and looked not altogether unlike a black beetle fastened to the hillside with a bright new pin.
One could see from the street right into the room with the hog's-leather hanging, which was slashed and torn; and the green grass and leaves about the balcony hung quite wild about the falling beams.
The glimmer of the lantern, as a trap opened, shone in like the heaven's sunlight; and though it only showed me the strong, dark beams of the ship that was my prison, I could have cried aloud for gladness.
But surely there were beams still left in the dismantled cottages near the church?
At last they came into a maze of dust, where a quantity of people were tumbling over one another, and where there was such a confusion of unaccountable shapes of beams, bulkheads, brick walls, ropes, and rollers, and such a mixing of gaslight and daylight, that they seemed to have got on the wrong side of the pattern of the universe.
As we were thus conversing in a low tone while Old Barley's sustained growl vibrated in the beam that crossed the ceiling, the room door opened, and a very pretty slight dark-eyed girl of twenty or so, came in with a basket in her hand: whom Herbert tenderly relieved of the basket, and presented blushing, as "Clara.
It was that rich afternoon sunlight that loves to flash into teacups as though they were crocuses, that loves to run a golden finger along the beautiful wrinkles of old faces and light up the noble hollows of age-worn eyes; the sunlight that loves to fall with transfiguring beam on the once dear book we never read, or, with malicious inquisitiveness, expose to undreamed- of detection the undusted picture, or the gold- dusted legs of remote chairs, which the poor housemaid has forgotten.
This intense heat they project in a parallel beam against any object they choose, by means of a polished parabolic mirror of unknown composition, much as the parabolic mirror of a lighthouse projects a beam of light.
Then I thrust the beam of wood far into the embers to heat it, and encouraged my men lest any of them should turn faint-hearted.