A theoretical approach based on electromagnetic scattering for analysing dielectric shimming in high-field MRI.
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| Title: | A theoretical approach based on electromagnetic scattering for analysing dielectric shimming in high-field MRI. |
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| Authors: | Brink, Wyger M.1, Remis, Rob F.2, Webb, Andrew G.1 |
| Source: | Magnetic Resonance in Medicine. May2016, Vol. 75 Issue 5, p2185-2194. 10p. |
| Abstract: | Purpose In this study, we analyzed dielectric shimming by formulating it as an electromagnetic scattering problem using integral equations. Methods Three-dimensional simulations of the radiofrequency field in two configurations using different materials were analyzed in terms of induced currents and secondary fields. A two-dimensional integral equation method with different backgrounds was used to identify the underlying physical mechanisms. This framework was then used to develop an inversion method for the design of dielectric pads. Results The effects of a dielectric pad can be attributed to the interference of a secondary field that is produced by the currents induced in the dielectric pad, radiating in an inhomogeneous background. The integral equation method with inhomogeneous background reduces the complexity of the forward and inverse problem significantly and can be used to optimize the permittivity distribution for a desired [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: 114539726 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: A theoretical approach based on electromagnetic scattering for analysing dielectric shimming in high-field MRI. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Brink%2C+Wyger+M%2E%22">Brink, Wyger M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Remis%2C+Rob+F%2E%22">Remis, Rob F.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Webb%2C+Andrew+G%2E%22">Webb, Andrew G.</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>. May2016, Vol. 75 Issue 5, p2185-2194. 10p. – Name: Abstract Label: Abstract Group: Ab Data: Purpose In this study, we analyzed dielectric shimming by formulating it as an electromagnetic scattering problem using integral equations. Methods Three-dimensional simulations of the radiofrequency field in two configurations using different materials were analyzed in terms of induced currents and secondary fields. A two-dimensional integral equation method with different backgrounds was used to identify the underlying physical mechanisms. This framework was then used to develop an inversion method for the design of dielectric pads. Results The effects of a dielectric pad can be attributed to the interference of a secondary field that is produced by the currents induced in the dielectric pad, radiating in an inhomogeneous background. The integral equation method with inhomogeneous background reduces the complexity of the forward and inverse problem significantly and can be used to optimize the permittivity distribution for a desired [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.25783 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 2185 Titles: – TitleFull: A theoretical approach based on electromagnetic scattering for analysing dielectric shimming in high-field MRI. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Brink, Wyger M. – PersonEntity: Name: NameFull: Remis, Rob F. – PersonEntity: Name: NameFull: Webb, Andrew G. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2016 Type: published Y: 2016 Identifiers: – Type: issn-print Value: 07403194 Numbering: – Type: volume Value: 75 – Type: issue Value: 5 Titles: – TitleFull: Magnetic Resonance in Medicine Type: main |
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