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Conference Papers Year : 2019

Enhancement of transmit and receive efficiencies with hybridized meta-atom in 7T head coil

Lisa Leroi
  • Function : Author
Zo Raolison
  • Function : Author
Redha Abdeddaim
  • Function : Author
  • PersonId : 952324
Tryfon Antonakakis
  • Function : Author
  • PersonId : 933476
Julien de Rosny
Alexandre Vignaud
Elodie Georget
  • Function : Author
  • PersonId : 952323
Benoît Larrat
  • Function : Author
  • PersonId : 884327
Gérard Tayeb
Nicolas Bonod
Alexis Amadon
Franck Mauconduit
Cyril Poupon
  • Function : Author
Denis Le Bihan
  • Function : Author
  • PersonId : 874117
Stefan Enoch

Abstract

Background B1 homogeneity in 7T MRI remains an important challenge in order to fully benefit from the signal enhancement due to the stronger magnetization available in ultra-high field scanners. High-dielectric constant pads have been proposed and optimized for passive shimming purposes [1-3]. Common formulations of dielectric pads for 7T applications are based on BaTiO 3 mixed with water. They present some drawbacks such as performance decay over time and toxicity. While previous studies tackled directly the formulation problem introducing new dielectric materials and solvent [4], we adopted a new approach based on metamaterials [5]. We demonstrated that the hybridization of four parallel metallic wires arranged on a square unit cell provides the ability to control radiofrequency field inside a 7T head birdcage. In the present work, we show that these hybridized meta-atom (HMA) can be used to improve MRI acquisition in the presence of a head receive array routinely used for in vivo MRI protocol.
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Dates and versions

hal-02508345 , version 1 (14-03-2020)

Identifiers

  • HAL Id : hal-02508345 , version 1

Cite

Marc Dubois, Lisa Leroi, Zo Raolison, Redha Abdeddaim, Tryfon Antonakakis, et al.. Enhancement of transmit and receive efficiencies with hybridized meta-atom in 7T head coil. International Society for Magnetic Resonance in Medicine 27th Annual Meeting, May 2019, Montréal, Canada. pp.1491. ⟨hal-02508345⟩
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