Shearlet-based regularized reconstruction in region-of-interest computed tomography

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http://hdl.handle.net/10138/307632

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Bubba , T A , Labate , D , Zanghirati , G & Bonettini , S 2018 , ' Shearlet-based regularized reconstruction in region-of-interest computed tomography ' , Mathematical Modelling of Natural Phenomena , vol. 13 , no. 4 , 34 . https://doi.org/10.1051/mmnp/2018014

Title: Shearlet-based regularized reconstruction in region-of-interest computed tomography
Author: Bubba, T. A.; Labate, D.; Zanghirati, G.; Bonettini, S.
Contributor: University of Helsinki, Department of Mathematics and Statistics
Date: 2018-05-21
Language: eng
Number of pages: 19
Belongs to series: Mathematical Modelling of Natural Phenomena
ISSN: 0973-5348
URI: http://hdl.handle.net/10138/307632
Abstract: Region of interest (ROI) tomography has gained increasing attention in recent years due to its potential to reducing radiation exposure and shortening the scanning time. However, tomographic reconstruction from ROI-focused illumination involves truncated projection data and typically results in higher numerical instability even when the reconstruction problem has unique solution. To address this problem, both ad hoc analytic formulas and iterative numerical schemes have been proposed in the literature. In this paper, we introduce a novel approach for ROI tomographic reconstruction, formulated as a convex optimization problem with a regularized term based on shearlets. Our numerical implementation consists of an iterative scheme based on the scaled gradient projection method and it is tested in the context of fan-beam CT. Our results show that our approach is essentially insensitive to the location of the ROI and remains very stable also when the ROI size is rather small.
Subject: 111 Mathematics
Computed tomography
region-of-interest reconstruction
shearlets
wavelets
gradient projection methods
Computed tomography
region-of-interest reconstruction
shearlets
wavelets
gradient projection methods
IMAGE-RECONSTRUCTION
GRADIENT METHODS
ITERATIVE RECONSTRUCTION
TRANSMISSION TOMOGRAPHY
TRUNCATED PROJECTIONS
ROI RECONSTRUCTION
TRANSFORM
SCAN
CT
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