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Sparse CT reconstruction based on multi-direction anisotropic total variation (MDATV)
BACKGROUND: The sparse CT (Computed Tomography), inspired by compressed sensing, means to introduce a prior information of image sparsity into CT reconstruction to reduce the input projections so as to reduce the potential threat of incremental X-ray dose to patients’ health. Recently, many remarkab...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4127084/ https://www.ncbi.nlm.nih.gov/pubmed/24993336 http://dx.doi.org/10.1186/1475-925X-13-92 |
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author | Li, Hongxiao Chen, Xiaodong Wang, Yi Zhou, Zhongxing Zhu, Qingzhen Yu, Daoyin |
author_facet | Li, Hongxiao Chen, Xiaodong Wang, Yi Zhou, Zhongxing Zhu, Qingzhen Yu, Daoyin |
author_sort | Li, Hongxiao |
collection | PubMed |
description | BACKGROUND: The sparse CT (Computed Tomography), inspired by compressed sensing, means to introduce a prior information of image sparsity into CT reconstruction to reduce the input projections so as to reduce the potential threat of incremental X-ray dose to patients’ health. Recently, many remarkable works were concentrated on the sparse CT reconstruction from sparse (limited-angle or few-view style) projections. In this paper we would like to incorporate more prior information into the sparse CT reconstruction for improvement of performance. It is known decades ago that the given projection directions can provide information about the directions of edges in the restored CT image. ATV (Anisotropic Total Variation), a TV (Total Variation) norm based regularization, could use the prior information of image sparsity and edge direction simultaneously. But ATV can only represent the edge information in few directions and lose much prior information of image edges in other directions. METHODS: To sufficiently use the prior information of edge directions, a novel MDATV (Multi-Direction Anisotropic Total Variation) is proposed. In this paper we introduce the 2D-IGS (Two Dimensional Image Gradient Space), and combined the coordinate rotation transform with 2D-IGS to represent edge information in multiple directions. Then by incorporating this multi-direction representation into ATV norm we get the MDATV regularization. To solve the optimization problem based on the MDATV regularization, a novel ART (algebraic reconstruction technique) + MDATV scheme is outlined. And NESTA (NESTerov’s Algorithm) is proposed to replace GD (Gradient Descent) for minimizing the TV-based regularization. RESULTS: The numerical and real data experiments demonstrate that MDATV based iterative reconstruction improved the quality of restored image. NESTA is more suitable than GD for minimization of TV-based regularization. CONCLUSIONS: MDATV regularization can sufficiently use the prior information of image sparsity and edge information simultaneously. By incorporating more prior information, MDATV based approach could reconstruct the image more exactly. |
format | Online Article Text |
id | pubmed-4127084 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-41270842014-08-11 Sparse CT reconstruction based on multi-direction anisotropic total variation (MDATV) Li, Hongxiao Chen, Xiaodong Wang, Yi Zhou, Zhongxing Zhu, Qingzhen Yu, Daoyin Biomed Eng Online Research BACKGROUND: The sparse CT (Computed Tomography), inspired by compressed sensing, means to introduce a prior information of image sparsity into CT reconstruction to reduce the input projections so as to reduce the potential threat of incremental X-ray dose to patients’ health. Recently, many remarkable works were concentrated on the sparse CT reconstruction from sparse (limited-angle or few-view style) projections. In this paper we would like to incorporate more prior information into the sparse CT reconstruction for improvement of performance. It is known decades ago that the given projection directions can provide information about the directions of edges in the restored CT image. ATV (Anisotropic Total Variation), a TV (Total Variation) norm based regularization, could use the prior information of image sparsity and edge direction simultaneously. But ATV can only represent the edge information in few directions and lose much prior information of image edges in other directions. METHODS: To sufficiently use the prior information of edge directions, a novel MDATV (Multi-Direction Anisotropic Total Variation) is proposed. In this paper we introduce the 2D-IGS (Two Dimensional Image Gradient Space), and combined the coordinate rotation transform with 2D-IGS to represent edge information in multiple directions. Then by incorporating this multi-direction representation into ATV norm we get the MDATV regularization. To solve the optimization problem based on the MDATV regularization, a novel ART (algebraic reconstruction technique) + MDATV scheme is outlined. And NESTA (NESTerov’s Algorithm) is proposed to replace GD (Gradient Descent) for minimizing the TV-based regularization. RESULTS: The numerical and real data experiments demonstrate that MDATV based iterative reconstruction improved the quality of restored image. NESTA is more suitable than GD for minimization of TV-based regularization. CONCLUSIONS: MDATV regularization can sufficiently use the prior information of image sparsity and edge information simultaneously. By incorporating more prior information, MDATV based approach could reconstruct the image more exactly. BioMed Central 2014-07-04 /pmc/articles/PMC4127084/ /pubmed/24993336 http://dx.doi.org/10.1186/1475-925X-13-92 Text en Copyright © 2014 Li et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/4.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. |
spellingShingle | Research Li, Hongxiao Chen, Xiaodong Wang, Yi Zhou, Zhongxing Zhu, Qingzhen Yu, Daoyin Sparse CT reconstruction based on multi-direction anisotropic total variation (MDATV) |
title | Sparse CT reconstruction based on multi-direction anisotropic total variation (MDATV) |
title_full | Sparse CT reconstruction based on multi-direction anisotropic total variation (MDATV) |
title_fullStr | Sparse CT reconstruction based on multi-direction anisotropic total variation (MDATV) |
title_full_unstemmed | Sparse CT reconstruction based on multi-direction anisotropic total variation (MDATV) |
title_short | Sparse CT reconstruction based on multi-direction anisotropic total variation (MDATV) |
title_sort | sparse ct reconstruction based on multi-direction anisotropic total variation (mdatv) |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4127084/ https://www.ncbi.nlm.nih.gov/pubmed/24993336 http://dx.doi.org/10.1186/1475-925X-13-92 |
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