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 volumeConference contributionScientificpeer-review

1 Citation (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 languageEnglish
Title of host publicationProceedings of the 2017 International Conference on Electromagnetics in Advanced Applications (ICEAA '17)
Place of PublicationPiscataway, NJ
PublisherIEEE
Pages417-420
Number of pages4
ISBN (Electronic)978-1-5090-4451-1
DOIs
Publication statusPublished - 2017
EventICEAA 2017: 19th International Conference on Electromagnetics in Advanced Applications - Verona, Italy
Duration: 11 Sep 201715 Sep 2017
Conference number: 19

Conference

ConferenceICEAA 2017
Abbreviated titleICEAA '17
CountryItaly
CityVerona
Period11/09/1715/09/17

Keywords

  • Dielectrics
  • Brain modeling
  • Reduced order systems
  • Head
  • Radio frequency

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    Gemert, J. H. F. V., Brink, W. M., Webb, A. G., & Remis, R. F. (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) (pp. 417-420). IEEE. https://doi.org/10.1109/ICEAA.2017.8065266