Stacked magnetic resonators for MRI RF coils decoupling

Abstract : Parallel transmission is a very promising method to tackle B 1 + 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 passive solution allows an efficient decoupling of active elements of a phased-array coil. We demonstrate the ability of this technique to significantly reduce by more than 10 dB the coupling preserving the quality of images compared to ideally isolated linear resonators on a spherical salty agar gel phantom in a 7 T MRI scanner.
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Submitted on : Thursday, July 19, 2018 - 6:23:26 PM
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Elodie Georget, Michel Luong, Alexandre Vignaud, Eric Giacomini, Edouard Chazel, et al.. Stacked magnetic resonators for MRI RF coils decoupling. Journal of Magnetic Resonance, Elsevier, 2017, 275, pp.11-18. ⟨10.1016/j.jmr.2016.11.012⟩. ⟨hal-01571588⟩

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