title: Stacked magnetic resonators for MRI RF coils decoupling.
abstract: Parallel transmission is a very promising method to tackle B1+field inhomogeneities at ultrahigh field in magnetic resonant imaging (MRI). This technique is however limited by the mutual coupling between the radiating elements. Here we propose to solve this problem by designing a passive magneto-electric resonator that we here refer to as stacked magnetic resonator (SMR). By combining numerical and experimental methodologies, we prove that this novelty passive solution allows an efficient decoupling of elements of a phased-array coil. We demonstrate the ability of this technique to significantly reduce by more than 10dB the coupling preserving the quality of images compared to ideally isolated linear resonators on a spherical salty agar gel phantom in a 7T MRI scanner.
authors.affiliation: Université Paris-Saclay, CEA-Saclay, DRF/I2BM/Neurospin/UNIRS, 91191 Gif-sur-Yvette Cedex, France. Electronic address: elodie.georget@cea.fr.
authors.forename: Elodie
authors.initials: E
authors.lastname: Georget
authors.affiliation: Université Paris-Saclay, CEA-Saclay, DRF/IRFU/SACM, 91191 Gif-sur-Yvette Cedex, France. Electronic address: michel.luong@cea.fr.
authors.forename: Michel
authors.initials: M
authors.lastname: Luong
authors.affiliation: Université Paris-Saclay, CEA-Saclay, DRF/I2BM/Neurospin/UNIRS, 91191 Gif-sur-Yvette Cedex, France. Electronic address: alexandre.vignaud@cea.fr.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Vignaud
authors.affiliation: Université Paris-Saclay, CEA-Saclay, DRF/I2BM/Neurospin/UNIRS, 91191 Gif-sur-Yvette Cedex, France. Electronic address: eric.giacomini@cea.fr.
authors.forename: Eric
authors.initials: E
authors.lastname: Giacomini
authors.affiliation: Université Paris-Saclay, CEA-Saclay, DRF/I2BM/Neurospin/UNIRS, 91191 Gif-sur-Yvette Cedex, France. Electronic address: edouard.chazel@cea.fr.
authors.forename: Edouard
authors.initials: E
authors.lastname: Chazel
authors.affiliation: Université Paris-Saclay, CEA-Saclay, DRF/IRFU/SACM, 91191 Gif-sur-Yvette Cedex, France. Electronic address: guillaume.ferrand@cea.fr.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Ferrand
authors.affiliation: Université Paris-Saclay, CEA-Saclay, DRF/I2BM/Neurospin/UNIRS, 91191 Gif-sur-Yvette Cedex, France. Electronic address: alexis.amadon@cea.fr.
authors.forename: Alexis
authors.initials: A
authors.lastname: Amadon
authors.affiliation: Siemens Healthcare, 93210 Saint-Denis, France. Electronic address: franck.mauconduit@siemens.com.
authors.forename: Franck
authors.initials: F
authors.lastname: Mauconduit
authors.affiliation: Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France. Electronic address: stefan.enoch@fresnel.fr.
authors.forename: Stefan
authors.initials: S
authors.lastname: Enoch
authors.affiliation: Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France. Electronic address: gerard.tayeb@fresnel.fr.
authors.forename: Gérard
authors.initials: G
authors.lastname: Tayeb
authors.affiliation: Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France. Electronic address: nicolas.bonod@fresnel.fr.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Bonod
authors.affiliation: Université Paris-Saclay, CEA-Saclay, DRF/I2BM/Neurospin/UNIRS, 91191 Gif-sur-Yvette Cedex, France. Electronic address: cyril.poupon@cea.fr.
authors.forename: Cyril
authors.initials: C
authors.lastname: Poupon
authors.affiliation: Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France. Electronic address: redha.abdeddaim@fresnel.fr.
authors.forename: Redha
authors.initials: R
authors.lastname: Abdeddaim
keywords: High-field RF coils; Linear resonator; Metamaterial; Passive decoupling; Phased array coil