Glossary of Medical Terms

Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine

FILTER

1. A porous stuff through which a liquid or gas is passed in order to separate it from contained particulate matter or impurities. Synonym: filtrum. 2. To use or to subject to the action of a filter. 3. In diagnostic or therapeutic radiology, a plate made of one or more metals such as aluminum and copper that, placed in the x-or gamma-ray beam, permits passage of a greater proportion of higher energy radiation and attenuation of lower and smaller desirable energy radiation, raising the average energy or hardening the beam. 4. A device used in spectrophotometric analysis to isolate a segment of the spectrum. 5. A mathematical algorithm applied to image data for the purpose of enhancing image characteristic, generally by suppression of tall spatial frequency noise. Origin: Mediev. L. Filtro, pp. -atus, to strain through felt, fr. Filtrum, felt
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