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Radiographic mottle: A comprehensive theory
Author(s) -
Barnes Gary T.
Publication year - 1982
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 - 10.1118/1.595126
Subject(s) - detective quantum efficiency , photon , optics , granularity , mottle , phosphor , computed radiography , physics , optical transfer function , radiography , optoelectronics , image quality , computer science , nuclear physics , image (mathematics) , plant virus , virus , virology , artificial intelligence , biology , operating system
A comprehensive theory of radiographic density fluctuations is developed. The theory incorporates film granularity, quantum mottle, the absorbed x‐ray photon energy distribution, fluctuations in phosphor light photon yield, and phosphor coating weight variations. The resulting expressions allow one to calculate the density fluctuations or, alternatively, the Wiener spectrum that will be obtained with a radiographic screen/film system from the physical parameters of the system. Reasonable agreement is obtained between experimental results and calculated values for three typical screen/film systems. An expression is also derived for the detective quantum efficiency (DQE) of screen/film systems, and the results of DQE calculations are presented for a commonly used screen/film combination as a function of density and of object size.