DocumentCode
845222
Title
Ciassification of Artifacts in X-Ray Cr Images Due to Nonlinear Shadows
Author
Duerinckx, Andre J. ; Macovski, Albert
Author_Institution
Information Systems Laboratory, Electrical Engineering Department, Durand Bldg., Rm. 120, Stanford University, Stanford, California 94305
Volume
26
Issue
2
fYear
1979
fDate
4/1/1979 12:00:00 AM
Firstpage
2848
Lastpage
2852
Abstract
Polychromaticity and noise artifacts in computed x-ray tomography can be traced to a nonlinear dependence of projection data and its variance upon an ideal consistent set of projection data. We describe both types of artifacts and present mathematical models. A comparison is made between artifacts in the image i(r) of CT values and artifacts in the distribution ¿2(r) of the noise variance. Three classification schemes for these nonlinear artifacts are presented: the physical origin of the artifacts (I), the geometrical appearance of the artifact (II), and the degree of consistency of the nonlinear shadow (III).
Keywords
Apertures; Chromium; Computed tomography; Detectors; Fluctuations; Image reconstruction; Mathematical model; X-ray imaging; X-ray scattering; X-ray tomography;
fLanguage
English
Journal_Title
Nuclear Science, IEEE Transactions on
Publisher
ieee
ISSN
0018-9499
Type
jour
DOI
10.1109/TNS.1979.4330548
Filename
4330548
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