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Exposure artifacts in raster scanned equalization radiography
Author(s) -
Plewes D. B.,
Vogelstein E.
Publication year - 1984
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595492
Subject(s) - raster scan , artifact (error) , scanner , raster graphics , collimator , optics , scan line , computed radiography , beam (structure) , helical scan , radiography , sensitivity (control systems) , computer science , image quality , computer vision , physics , acoustics , pixel , image (mathematics) , electronic engineering , magnetic tape , grayscale , tape recorder , nuclear physics , engineering
The image artifacts characteristic of a scanning chest radiographic system are reviewed. The technique employs a pulsed beam of radiation swept in an overlapping raster pattern that can result in severe ripple and scan line artifacts with improper scanning parameters. A one‐dimensional treatment of the scanner geometry shows that the artifacts can be eliminated when the beam width is an integral multiple of interpulse spacing. An extension to a two‐dimensional analysis indicates that with the collimator geometries employed, artifact‐free images are not possible with a fixed x‐ray frequency but can be achieved when a variable frequency source is used. A treatment of the sensitivity for artifact formation shows that with proper choice of scanning parameters sizable errors in beam width can be tolerated without significant artifact formation.