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Learned Shrinkage Approach for Low-Dose Reconstruction in Computed Tomography
Joint Authors
Zibulevsky, Michael
Shtok, Joseph
Elad, Michael
Source
International Journal of Biomedical Imaging
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-20, 20 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2013-06-20
Country of Publication
Egypt
No. of Pages
20
Main Subjects
Abstract EN
We propose a direct nonlinear reconstruction algorithm for Computed Tomography (CT), designed to handle low-dose measurements.
It involves the filtered back-projection and adaptive nonlinear filtering in both the projection and the image domains.
The filter is an extension of the learned shrinkage method by Hel-Or and Shaked to the case of indirect observations.
The shrinkage functions are learned using a training set of reference CT images.
The optimization is performed with respect to an error functional in the image domain that combines the mean square error with a gradient-based penalty, promoting image sharpness.
Our numerical simulations indicate that the proposed algorithm can manage well with noisy measurements, allowing a dose reduction by a factor of 4, while reducing noise and streak artifacts in the FBP reconstruction, comparable to the performance of a statistically based iterative algorithm.
American Psychological Association (APA)
Shtok, Joseph& Elad, Michael& Zibulevsky, Michael. 2013. Learned Shrinkage Approach for Low-Dose Reconstruction in Computed Tomography. International Journal of Biomedical Imaging،Vol. 2013, no. 2013, pp.1-20.
https://search.emarefa.net/detail/BIM-484825
Modern Language Association (MLA)
Shtok, Joseph…[et al.]. Learned Shrinkage Approach for Low-Dose Reconstruction in Computed Tomography. International Journal of Biomedical Imaging No. 2013 (2013), pp.1-20.
https://search.emarefa.net/detail/BIM-484825
American Medical Association (AMA)
Shtok, Joseph& Elad, Michael& Zibulevsky, Michael. Learned Shrinkage Approach for Low-Dose Reconstruction in Computed Tomography. International Journal of Biomedical Imaging. 2013. Vol. 2013, no. 2013, pp.1-20.
https://search.emarefa.net/detail/BIM-484825
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-484825