| BDR | background diabetic retinopathy |
|---|---|
| BI | background interval; bacterial or bactericidal index; base-in [prism]; basilar impression; Billroth ... |
| Bkg | background |
| ANT | acoustic noise test; adenine nucleotide translocator; aminonitrothiazole; anterior |
| APN | acute pyelonephritis; advanced practice nurse; average peak noise |
| BGE | Background electrolyte |
|---|---|
| NESB | Non English Speaking Background |
| B | background |
| CNR | Contrast-to-Noise Ratio |
| C/N | Contrast-to-noise |
| background level | The average amount of a substance present in the environment. Originally referring to naturally occurring phenomena. Used in toxic substance monitoring. (05 Dec 1998) |
|---|---|
| background radiation | <radiobiology> Level of environmental radation due to background sources. Background sources can be natural, such as cosmic rays and natural radioactive elements (principally radon, but including other elements such as isotopes of potassium (which people get substantial amounts of in foods like bananas)). They can also be man-made, such as from fossil-fuel combustion, everyday leakage from nuclear activities, and leftover from atmospheric nuclear weapons tests. Background radiation is usually distinguished from acute radiation, such as from medical X-rays, nuclear accidents, radioisotope therapy, or other short-term doses. The man-made contribution to background radiation is quite small compared to the natural contribution, medical uses dominate human exposure to acute radiation. (09 Oct 1997) |
| background retinopathy | <ophthalmology, pathology> Early stage of diabetic retinopathy, it usually does not impair vision. Origin: Gr. Pathos = disease (09 Oct 1997) |
| hearing loss, noise-induced | Hearing loss from exposure to noise. The loss is often in the frequency range 4000-6000 hertz. (12 Dec 1998) |
| signal-to-noise ratio | <microscopy> Also sometimes used as an abbreviation for serial number, can be somewhat confusing in the case of electronic equipment. (05 Aug 1998) |
| structured noise | In radiology, the signals from anatomic structures which interfere with the detection of significant pathology. (05 Mar 2000) |
| noise | 1. Sound of any kind. "The heavens turn about in a most rapid motion without noise to us perceived." (Bacon) Noise is either a sound of too short a duration to be determined, like the report of a cannon; or else it is a confused mixture of many discordant sounds, like the rolling of thunder or the noise of the waves. Nevertheless, the difference between sound and noise is by no means precise. 2. Especially, loud, confused, or senseless sound; clamor; din. 3. Loud or continuous talk; general talk or discussion; rumor; report. "The noise goes." "What noise have we had about transplantation of diseases and transfusion of blood!" (T. Baker) "Soerates lived in Athens during the great plague which has made so much noise in all ages." (Spectator) 4. Music, in general; a concert; also, a company of musicians; a band. "The king has his noise of gypsies." (B. Jonson) Synonym: Cry, outcry, clamor, din, clatter, uproar. Origin: F. Noise noisy strife, quarrel, brawl, fr. L. Nausea seasickness, sickness, disgust. See Nausea. Source: Websters Dictionary (01 Mar 1998) |
| noise-induced deafness | A type of sensorineural deafness caused by prolonged exposure to loud sounds, e.g., jet engines. (05 Mar 2000) |
| noise, occupational | Noise present in occupational, industrial, and factory situations. (12 Dec 1998) |
| noise, transportation | Noise associated with transportation, particularly aircraft and automobiles. (12 Dec 1998) |
| optical noise | <microscopy> Image defects that become especially conspicuous when the image is enhanced. In video microscopy, includes hot spots, mottle, uneven illumination, etc. (05 Aug 1998) |
| background noise | extraneous noise contaminating sound measurements that cannot be separated from the desired signal |
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