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Statistical limitations in x‐ray reconstructive tomography
Author(s) -
Brooks Rodney A.,
Di Chiro Giovanni
Publication year - 1976
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 - 10.1118/1.594240
Subject(s) - noise (video) , scanner , tomography , physics , constant (computer programming) , optics , image resolution , resolution (logic) , iterative reconstruction , computational physics , computer science , computer vision , artificial intelligence , image (mathematics) , programming language
Statistical fluctuations, or noise, in reconstructed tomograms are analyzed as a function of x‐ray energy. The result is essentially constant for energies above 50 keV, assuming constant dose and spatial resolution, and is in close agreement with the actual performance of the EMI‐Scanner (water‐bag model). The noise is inversely proportional to the square of cell dimensions. For scanners without a water bag, the theoretical noise is approximately 30% less.