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A simple theorem relating noise and patient dose in computed tomography
Author(s) -
Harpen Michael D.
Publication year - 1999
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 - 10.1118/1.598778
Subject(s) - noise (video) , computed tomography , iterative reconstruction , filter (signal processing) , tomography , simple (philosophy) , cone beam computed tomography , optics , computed radiography , medical physics , physics , image quality , image (mathematics) , computer science , computer vision , radiology , medicine , philosophy , epistemology
Presented is a simple model describing the dependence of image noise in computed tomography on the x‐ray beam profile. The model is used to derive the x‐ray profile which minimizes total image noise at constant integral patient dose. The profile may be produced with a bow‐tie‐type beam shaping filter. Results of the analysis are validated using a computer simulation of computed tomography (CT) acquisition and reconstruction.