Designing High-Permittivity Pads for Dielectric Shimming in MRI using Model Order Reduction and Gauss-Newton Optimization

J. H. F. van Gemert; W.M. Brink; A.G. Webb; R.F. Remis

doi:10.1109/ICEAA.2017.8065266

Designing High-Permittivity Pads for Dielectric Shimming in MRI using Model Order Reduction and Gauss-Newton Optimization

J. H. F. van Gemert, W.M. Brink, A.G. Webb, R.F. Remis

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

2 Citations (Scopus)

Abstract

High-field MRI reduces the homogeneity of the B1+ transmit field, which in turn degrades the quality of MR images. High-permittivity pads are increasingly used to restore the homogeneity of this transmit field. Designing such a pad in terms of dimensions, position, and constitution is not trivial, however, and in this work we propose a design method that can be used to find an optimal pad for a certain imaging region of interest. By incorporating a projection based model order reduction technique in a Gauss-Newton optimization method, optimal dielectric pads can be found at significantly reduced computation times. We illustrate the performance of our optimization method by designing a pad for 7T cerebellum imaging and show its effectiveness in an actual MR imaging experiment.

Original language	English
Title of host publication	Proceedings of the 2017 International Conference on Electromagnetics in Advanced Applications (ICEAA '17)
Place of Publication	Piscataway, NJ
Publisher	IEEE
Pages	417-420
Number of pages	4
ISBN (Electronic)	978-1-5090-4451-1
DOIs	https://doi.org/10.1109/ICEAA.2017.8065266
Publication status	Published - 2017
Event	ICEAA 2017: 19th International Conference on Electromagnetics in Advanced Applications - Verona, Italy Duration: 11 Sept 2017 → 15 Sept 2017 Conference number: 19

Conference

Conference	ICEAA 2017
Abbreviated title	ICEAA '17
Country/Territory	Italy
City	Verona
Period	11/09/17 → 15/09/17

Keywords

Dielectrics
Brain modeling
Reduced order systems
Head
Radio frequency

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10.1109/ICEAA.2017.8065266

Cite this

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title = "Designing High-Permittivity Pads for Dielectric Shimming in MRI using Model Order Reduction and Gauss-Newton Optimization",

abstract = "High-field MRI reduces the homogeneity of the B1+ transmit field, which in turn degrades the quality of MR images. High-permittivity pads are increasingly used to restore the homogeneity of this transmit field. Designing such a pad in terms of dimensions, position, and constitution is not trivial, however, and in this work we propose a design method that can be used to find an optimal pad for a certain imaging region of interest. By incorporating a projection based model order reduction technique in a Gauss-Newton optimization method, optimal dielectric pads can be found at significantly reduced computation times. We illustrate the performance of our optimization method by designing a pad for 7T cerebellum imaging and show its effectiveness in an actual MR imaging experiment.",

keywords = "Dielectrics, Brain modeling, Reduced order systems, Head, Radio frequency",

author = "Gemert, {J. H. F. van} and W.M. Brink and A.G. Webb and R.F. Remis",

year = "2017",

doi = "10.1109/ICEAA.2017.8065266",

language = "English",

pages = "417--420",

booktitle = "Proceedings of the 2017 International Conference on Electromagnetics in Advanced Applications (ICEAA '17)",

publisher = "IEEE",

address = "United States",

note = "ICEAA 2017 : 19th International Conference on Electromagnetics in Advanced Applications, ICEAA '17 ; Conference date: 11-09-2017 Through 15-09-2017",

}

Gemert, JHFV, Brink, WM, Webb, AG & Remis, RF 2017, Designing High-Permittivity Pads for Dielectric Shimming in MRI using Model Order Reduction and Gauss-Newton Optimization. in Proceedings of the 2017 International Conference on Electromagnetics in Advanced Applications (ICEAA '17). IEEE, Piscataway, NJ, pp. 417-420, ICEAA 2017, Verona, Italy, 11/09/17. https://doi.org/10.1109/ICEAA.2017.8065266

Designing High-Permittivity Pads for Dielectric Shimming in MRI using Model Order Reduction and Gauss-Newton Optimization. / Gemert, J. H. F. van; Brink, W.M.; Webb, A.G. et al.
Proceedings of the 2017 International Conference on Electromagnetics in Advanced Applications (ICEAA '17). Piscataway, NJ: IEEE, 2017. p. 417-420.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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T1 - Designing High-Permittivity Pads for Dielectric Shimming in MRI using Model Order Reduction and Gauss-Newton Optimization

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AU - Remis, R.F.

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N2 - High-field MRI reduces the homogeneity of the B1+ transmit field, which in turn degrades the quality of MR images. High-permittivity pads are increasingly used to restore the homogeneity of this transmit field. Designing such a pad in terms of dimensions, position, and constitution is not trivial, however, and in this work we propose a design method that can be used to find an optimal pad for a certain imaging region of interest. By incorporating a projection based model order reduction technique in a Gauss-Newton optimization method, optimal dielectric pads can be found at significantly reduced computation times. We illustrate the performance of our optimization method by designing a pad for 7T cerebellum imaging and show its effectiveness in an actual MR imaging experiment.

AB - High-field MRI reduces the homogeneity of the B1+ transmit field, which in turn degrades the quality of MR images. High-permittivity pads are increasingly used to restore the homogeneity of this transmit field. Designing such a pad in terms of dimensions, position, and constitution is not trivial, however, and in this work we propose a design method that can be used to find an optimal pad for a certain imaging region of interest. By incorporating a projection based model order reduction technique in a Gauss-Newton optimization method, optimal dielectric pads can be found at significantly reduced computation times. We illustrate the performance of our optimization method by designing a pad for 7T cerebellum imaging and show its effectiveness in an actual MR imaging experiment.

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KW - Brain modeling

KW - Reduced order systems

KW - Head

KW - Radio frequency

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ER -

Designing High-Permittivity Pads for Dielectric Shimming in MRI using Model Order Reduction and Gauss-Newton Optimization

Abstract

Conference

Keywords

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Cite this