| LSF | linear spread function; lymphocyte-stimulating factor |
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| PSF | peak scatter factor; peptide supply factor; point spread function; pseudosarcomatous fasciitis |
| LSF | Line spread functions |
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| PSF | Point Spread Function |
| SOBP | Spread Out Bragg Peak |
| airborne infection | A mechanism of transmission of an infectious agent by particles, dust, or droplet nuclei suspended in the air. (05 Mar 2000) |
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| airborne radioactivity | <radiobiology> Radioactivity in any chemical or physical form that is dissolved, mixed, suspended or otherwise entrained in air. (16 Dec 1997) |
| metastatic spread | <oncology> Process of development of secondary tumours. Involves local invasion (in most cases), passive transport, lodgement and proliferation at a remote site. (18 Nov 1997) |
| common vehicle spread | Spread of disease agent from a source that is common to those who acquire the disease, e.g., water, milk, air, syringe contaminated by infectious or noxious agents. (05 Mar 2000) |
| point-spread function | <microscopy> The mathematical representation of the image of a point source. For a diffraction-limited optical system operating in the absence of aberrations, the point-spread function is the Airy disk. See: three-dimensional diffraction pattern. (05 Aug 1998) |
| spread | 1. To extend in length and breadth, or in breadth only; to stretch or expand to a broad or broader surface or extent; to open; to unfurl; as, to spread a carpet; to spread a tent or a sail. "He bought a parcel of a field where he had spread his tent." (Gen. Xxxiii. 19) "Here the Rhone Hath spread himself a couch." (Byron) 2. To extend so as to cover something; to extend to a great or grater extent in every direction; to cause to fill or cover a wide or wider space. "Rose, as in a dance, the stately trees, and spread Their branches hung with copious fruit." (Milton) 3. To divulge; to publish, as news or fame; to cause to be more extensively known; to disseminate; to make known fully; as, to spread a report; often acompanied by abroad. "They, when they were departed, spread abroad his fame in all that country." (Matt. Ix. 31) 4. To propagate; to cause to affect great numbers; as, to spread a disease. 5. To diffuse, as emanations or effluvia; to emit; as, odouriferous plants spread their fragrance. 6. To strew; to scatter over a surface; as, to spread manure; to spread lime on the ground. 7. To prepare; to set and furnish with provisions; as, to spread a table. "Boiled the flesh, and spread the board." (Tennyson) To sprad cloth, to unfurl sail. Synonym: To diffuse, propogate, disperse, publish, distribute, scatter, circulate, disseminate, dispense. Origin: OE. Spreden, AS. Spraedan; akin to D. Spreiden, spreijen, LG. Spreden, spreen, spreien, G. Spreiten, Dan. Sprede, Sw. Sprida. Cf. Spray water flying in drops. 1. To extend in length and breadth in all directions, or in breadth only; to be extended or stretched; to expand. "Plants, if they spread much, are seldom tall." (Bacon) "Govrnor Winthrop, and his associates at Charlestown, had for a church a large, spreading tree." (B. Trumbull) 2. To be extended by drawing or beating; as, some metals spread with difficulty. 3. To be made known more extensively, as news. 4. To be propagated from one to another; as, the disease spread into all parts of the city. 1. Extent; compass. "I have got a fine spread of improvable land." (Addison) 2. Expansion of parts. "No flower hath spread like that of the woodbine." (Bacon) 3. A cloth used as a cover for a table or a bed. 4. A table, as spread or furnished with a meal; hence, an entertainment of food; a feast. 5. A privilege which one person buys of another, of demanding certain shares of stock at a certain price, or of delivering the same shares of stock at another price, within a time agreed upon. 6. <geometry> An unlimited expanse of discontinuous points. Source: Websters Dictionary (01 Mar 1998) |
| line spread function | A measure of the ability of a system to form sharp images; in radiology, determined by measuring the spatial density distribution on film of the X-ray image of a narrow slit in a dense metal, such as uranium; from this can be calculated the modulation transfer function. (05 Mar 2000) |
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