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Correction for beam hardening in computed tomography
Author(s) -
Kijewski Peter K.,
Bjärngard Bengt E.
Publication year - 1978
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 - 10.1118/1.594429
Subject(s) - attenuation , optics , computed tomography , beam (structure) , correction for attenuation , tomography , computational physics , materials science , physics , nuclear medicine , radiology , medicine
Corrections for beam‐hardening artifacts in computed tomography can be made by using a model which assumes that water and bone mineral are the only constituents of tissue. With this model, a correction factor for the measured transmission values can be calculated such that the reconstructed attenuation coefficients have values corresponding to a monoenergetic source of known energy. Systematic errors in the uncorrected attenuation coefficients, which may be 5%, can be reduced to less than 1% if corrected transmission values are used.