Iterative projection onto convex sets for quantitative susceptibility mapping.
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| Title: | Iterative projection onto convex sets for quantitative susceptibility mapping. |
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| Authors: | Deng, Weiran1, Boada, Fernando2, Poser, Benedikt A.1, Schirda, Claudiu3, Stenger, Victor Andrew1 |
| Source: | Magnetic Resonance in Medicine. Feb2015, Vol. 73 Issue 2, p697-703. 7p. |
| Abstract: | Purpose Quantitative susceptibility map (QSM) reconstruction is ill posed due to the zero values on the 'magic angle cone' that make the maps prone to streaking artifacts. We propose projection onto convex sets (POCS) in the method of steepest descent (SD) for QSM reconstruction. Methods Two convex projections, an object-support projection in the image domain and a projection in k-space were used. QSM reconstruction using the proposed SD-POCS method was compared with SD and POCS alone as well as with truncated k-space division (TKD) for numerically simulated and 7 Tesla (T) human brain phase data. Results The QSM reconstruction error from noise-free simulated phase data using SD-POCS is at least two orders of magnitude lower than using SD, POCS, or TKD and has reduced streaking artifacts. Using the l1-TV reconstructed susceptibility as a gold standard for 7T in vivo imaging, SD-POCS showed better image quality comparing to SD, POCS, or TKD from visual inspection. Conclusion POCS is an alternative method for regularization that can be used in an iterative minimization method such as SD for QSM reconstruction. Magn Reson Med 73:697-703, 2015. © 2014 Wiley Periodicals, Inc. [ABSTRACT FROM AUTHOR] |
| Copyright of Magnetic Resonance in Medicine is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 100438591 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Iterative projection onto convex sets for quantitative susceptibility mapping. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Deng%2C+Weiran%22">Deng, Weiran</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Boada%2C+Fernando%22">Boada, Fernando</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Poser%2C+Benedikt+A%2E%22">Poser, Benedikt A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Schirda%2C+Claudiu%22">Schirda, Claudiu</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Stenger%2C+Victor+Andrew%22">Stenger, Victor Andrew</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Magnetic+Resonance+in+Medicine%22">Magnetic Resonance in Medicine</searchLink>. Feb2015, Vol. 73 Issue 2, p697-703. 7p. – Name: Abstract Label: Abstract Group: Ab Data: Purpose Quantitative susceptibility map (QSM) reconstruction is ill posed due to the zero values on the 'magic angle cone' that make the maps prone to streaking artifacts. We propose projection onto convex sets (POCS) in the method of steepest descent (SD) for QSM reconstruction. Methods Two convex projections, an object-support projection in the image domain and a projection in k-space were used. QSM reconstruction using the proposed SD-POCS method was compared with SD and POCS alone as well as with truncated k-space division (TKD) for numerically simulated and 7 Tesla (T) human brain phase data. Results The QSM reconstruction error from noise-free simulated phase data using SD-POCS is at least two orders of magnitude lower than using SD, POCS, or TKD and has reduced streaking artifacts. Using the l1-TV reconstructed susceptibility as a gold standard for 7T in vivo imaging, SD-POCS showed better image quality comparing to SD, POCS, or TKD from visual inspection. Conclusion POCS is an alternative method for regularization that can be used in an iterative minimization method such as SD for QSM reconstruction. Magn Reson Med 73:697-703, 2015. © 2014 Wiley Periodicals, Inc. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Magnetic Resonance in Medicine is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/mrm.25155 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 697 Titles: – TitleFull: Iterative projection onto convex sets for quantitative susceptibility mapping. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Deng, Weiran – PersonEntity: Name: NameFull: Boada, Fernando – PersonEntity: Name: NameFull: Poser, Benedikt A. – PersonEntity: Name: NameFull: Schirda, Claudiu – PersonEntity: Name: NameFull: Stenger, Victor Andrew IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2015 Type: published Y: 2015 Identifiers: – Type: issn-print Value: 07403194 Numbering: – Type: volume Value: 73 – Type: issue Value: 2 Titles: – TitleFull: Magnetic Resonance in Medicine Type: main |
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