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Iterative method for elimination of the K β filter in dual‐beam differential tissue absorptiometry
Author(s) -
Bolin Frank P.,
Preuss Luther E.
Publication year - 1977
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 - 10.1118/1.594366
Subject(s) - filter (signal processing) , iterative method , beam (structure) , photon , optics , energy (signal processing) , physics , mathematics , algorithm , computer science , computer vision , quantum mechanics
The application of a dual photon beam to the measurement of tissue and tissue‐like substances has generally required the use of a filter to attain the required monochromaticity of the lower‐energy x‐ray photons. In many cases this has the undesirable effect of also severely attenuating the desired low‐energy beam. A method for circumventing the use of the filter is described. The technique relies on a knowledge of the initial intensities of the components of the x‐ray portion of the dual beam and involves an iterative mathematical procedure. Experimental verification of the method using both tissue and nontissue substances has been carried out. R values obtained with the iterative system show good correlation with filtered values.