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 journalArticleAcademicpeer-review

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 languageEnglish
Article number106835
Number of pages6
JournalJournal of Magnetic Resonance
Volume320
DOIs
Publication statusPublished - Nov 2020
Externally publishedYes

Keywords

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

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