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MetaMaterials antenna for ultra-high field Mri

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Accueil › Scientific publications › Hilbert fractal inspired dipoles for passive RF shimming in ultra-high field MRI

Hilbert fractal inspired dipoles for passive RF shimming in ultra-high field MRI

janvier 12, 2022

Hilbert fractal inspired dipoles for passive RF shimming in ultra-high field MRI, Author links open overlay panelTania S. Vergara Gomez, Marc Dubois, Kaizad Rustomji, Elodie Georget, Tryfon Antonakakis, Alexandre Vignaud, Stanislas Rapacchi, Olivier M.Girard, Frank Kober, Stefan Enoch, Redha Abdeddaim, in Photonics and Nanostructures – Fundamentals and Applications (PNFA) Volume 48, February 2022, 100988.

 

https://doi.org/10.1016/j.photonics.2021.100988

Abstract

Ultra-high field MRI head coils present a characteristic B1+ magnetic field distribution resulting in inhomogeneous signal and contrast over the image, affecting relevant regions of interest such as the temporal lobes of the brain and the cerebellum. This is a consequence of the spatially varying flip angle distribution attributed to the reduction of the electromagnetic wavelength inside the human tissues. Without radical changes in the experimental setup, this problem has been effectively targeted by different passive RF shimming approaches such as high permittivity dielectric pads or metamaterials. The latter, however, may potentially decrease the B1+ field in other relevant areas or compromise the patient’s comfort. Here, we present a novel approach based on meander dipoles inspired from Hilbert fractals. The structures were designed and studied numerically using finite element simulations. Prototypes of the structures were printed and tested with a 1Tx/32Rx birdcage head coil on a 7 T MR scanner. We demonstrate a new device based on compact, thin and flexible design, able to improve the B1+ field over each temporal lobe without deterioration of the RF performances in other brain areas and with minimal impact on patient comfort.

Partners

Aix Marseille University (InstitutFresnel, CRMBM)- AMIDEX – Multiwave Imaging, CEA NeuroSpin, M-One FET project

Keywords : Passive RF shimming, Fractals, Hilbert curves, UHF MRI, Head imaging

 

janvier 12, 2022

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This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 736937