Science / Spiders / Three-Dimensional Projection Matching: a method of refinement in reconstructing single particles from their projections [Penczek et al., 1994]. A preliminary 3D map, obtained by random-conical reconstruction or angular reconstitution, is used to compute 'predicted projections' on a grid in angular space, which are held in the computer memory. One by one, the experimental projections are now compared (by cross-correlation, See CCF) with the set of predicted projections, to find the best Eulerian angles representing their projection direction. Next, a refined 3D map is computed, and again this is used to compute 'predicted projections,' etc. For self-consistent, homogeneous data sets, this procedure converges in a higher-resolution 3D map.
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Matching Verb Synonyms: corresponding, homologous, comparable, equivalent, complementary
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Projection Verb Synonyms: protrusion, protuberance, bulge, extension, overhang, ledge, flange, ridge, eminence, prominence, spur, crag, outcropping
Projection Noun Synonyms: proposal, outlining, mapping, mapping out, presenting, presentation
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Entertainment / Fantasy Football / Projections: The predicted statistics of NFL players used to help determine a player's fantasy value. MORE
Entertainment / Photography / Projection Cutting: Any method of printing in which the image is optically projected on the sensitized material. MORE
Business / Finance / Projection: The use of econometric models to forecast the future performance of a company, country, or other financial entity using historical and current information. MORE