beam

BEAM

 

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

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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.

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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.

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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

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

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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.