A new quadrature annular resonator for 3 T MRI based on artificial-dielectrics

Anna A. Mikhailovskaya, Alena V. Shchelokova, Dmitry A. Dobrykh, Ivan V. Sushkov, Alexey P. Slobozhanyuk, Andrew Webb*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Dielectric resonators have previously been constructed for ultra-high frequency magnetic resonance imaging and microscopy. However, it is challenging to design these dielectric resonators at clinical field strengths due to their intrinsically large dimensions, especially when using materials with moderate permittivity. Here we propose and characterize a novel approach using artificial-dielectrics which reduces substantially the required outer diameter of the resonator. For a resonator designed to operate in a 3 Tesla scanner using water as the dielectric, a reduction in outer diameter of 37% was achieved. When used in an inductively-coupled wireless mode, the sensitivity of the artificial-dielectric resonator was measured to be slightly higher than that of a standard dielectric resonator operating in its degenerate circularly-polarized hybrid electromagnetic modes (HEM11). This study demonstrates the first application of an artificial-dielectric approach to MR volume coil design.

Original languageEnglish
Pages (from-to)47-52
Number of pages6
JournalJournal of Magnetic Resonance
StatePublished - Jun 2018
Externally publishedYes


  • Artificial-dielectrics
  • Dielectric resonators
  • High field MRI
  • High permittivity
  • Metamaterials


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