An artificial dielectric slab for ultra high-field MRI: Proof of concept

Vsevolod Vorobyev; Alena Shchelokova; Irena Zivkovic; Alexey Slobozhanyuk; Juan D. Baena; Juan P. del Risco; Redha Abdeddaim; Andrew Webb; Stanislav Glybovski

doi:10.1016/j.jmr.2020.106835

An artificial dielectric slab for ultra high-field MRI: Proof of concept

Vsevolod Vorobyev
, Alena Shchelokova
, Irena Zivkovic
, Alexey Slobozhanyuk
, Juan D. Baena
, Juan P. del Risco
, Redha Abdeddaim
, Andrew Webb
, Stanislav Glybovski (Corresponding author)

Research output: Contribution to journal › Article › Academic › peer-review

38 Citations (Scopus)

Abstract

High-permittivity dielectric pads, i.e., thin, flexible slabs, usually consisting of mixed ceramic powders and liquids, have been previously shown to increase the magnetic field at high and ultra high-fields in regions of low efficiency of transmit coils, thus improving the homogeneity of images. However, their material parameters can change with time, and some materials they contain are bio incompatible. This article presents an alternative approach replacing ceramic mixtures with a low-cost and stable artificial dielectric slab. The latter comprises a stack of capacitive grids realized using multiple printed-circuit boards. Results in this article show that the proposed artificial dielectric structure can obtain the same increase in the local transmit radiofrequency magnetic field distribution in a head phantom at 7 T as the conventional dielectric pad.

Original language	English
Article number	106835
Number of pages	6
Journal	Journal of Magnetic Resonance
Volume	320
DOIs	https://doi.org/10.1016/j.jmr.2020.106835
Publication status	Published - Nov 2020

Funding

. The authors thank Dr.ir. Wyger Brink and Mr. Thomas Ruytenberg for assistance with dielectric pad and artificial dielectric slab fabrication. The experimental studies were supported by the European Union Horizon 2020 research and innovation program under the grant agreement No. 736937 and Horizon 2020 ERC Advanced NOMA-MRI 670629. The numerical studies were supported by the Russian Science Foundation (Grant No. 18-79-10167). A. Shchelokova acknowledges funding support from the ISMRM RExGP.

Funders	Funder number
European Union's Horizon 2020 - Research and Innovation Framework Programme	670629
Russian Science Foundation	18-79-10167
European Union's Horizon 2020 - Research and Innovation Framework Programme	736937

Keywords

7 T
Artificial dielectric
B inhomogeneity
Dielectric pad
Metamaterial
Radiofrequency coil
Ultra high-field MRI

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10.1016/j.jmr.2020.106835

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title = "An artificial dielectric slab for ultra high-field MRI: Proof of concept",

abstract = "High-permittivity dielectric pads, i.e., thin, flexible slabs, usually consisting of mixed ceramic powders and liquids, have been previously shown to increase the magnetic field at high and ultra high-fields in regions of low efficiency of transmit coils, thus improving the homogeneity of images. However, their material parameters can change with time, and some materials they contain are bio incompatible. This article presents an alternative approach replacing ceramic mixtures with a low-cost and stable artificial dielectric slab. The latter comprises a stack of capacitive grids realized using multiple printed-circuit boards. Results in this article show that the proposed artificial dielectric structure can obtain the same increase in the local transmit radiofrequency magnetic field distribution in a head phantom at 7 T as the conventional dielectric pad.",

keywords = "7 T, Artificial dielectric, B inhomogeneity, Dielectric pad, Metamaterial, Radiofrequency coil, Ultra high-field MRI",

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AU - Vorobyev, Vsevolod

AU - Shchelokova, Alena

AU - Zivkovic, Irena

AU - Slobozhanyuk, Alexey

AU - Baena, Juan D.

AU - del Risco, Juan P.

AU - Abdeddaim, Redha

AU - Webb, Andrew

AU - Glybovski, Stanislav

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KW - B inhomogeneity

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KW - Metamaterial

KW - Radiofrequency coil

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An artificial dielectric slab for ultra high-field MRI: Proof of concept

Abstract

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Keywords

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