Experimental investigation of a metasurface resonator for in vivo imaging at 1.5 T

Alena V Shchelokova, Alexey P Slobozhanyuk, Paul de Bruin, Irena Zivkovic, Efthymios Kallos, Pavel A Belov, Andrew Webb

Research output: Contribution to journalArticleAcademicpeer-review

42 Citations (Scopus)

Abstract

In this work, we experimentally demonstrate an increase in the local transmit efficiency of a 1.5 T MRI scanner by using a metasurface formed by an array of brass wires embedded in a high permittivity low loss medium. Placement of such a structure inside the scanner results in strong coupling of the radiofrequency field produced by the body coil with the lowest frequency electromagnetic eigenmode of the metasurface. This leads to spatial redistribution of the near fields with enhancement of the local magnetic field and an increase in the transmit efficiency per square root maximum specific absorption rate in the region-of-interest. We have investigated this structure in vivo and achieved a factor of 3.3 enhancement in the local radiofrequency transmit efficiency.

Original languageEnglish
Pages (from-to)78-81
Number of pages4
JournalJournal of Magnetic Resonance
Volume286
DOIs
Publication statusPublished - Jan 2018
Externally publishedYes

Bibliographical note

Copyright © 2017 Elsevier Inc. All rights reserved.

Keywords

  • Computer Simulation
  • Electromagnetic Fields
  • Equipment Design
  • Magnetic Resonance Imaging/instrumentation
  • Radio Waves

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