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“Kerker effect in ultrahigh-field magnetic resonance imaging"

A team of physicists from our Lab, the Langevin Institute and the CEA NeuroSpin recently published in the prestigious Physics Review X their work on Metamaterials to improve the quality of ultra-high field magnetic resonance imaging (MRI 7T).

Novel metamaterial approach improves image quality of magnetic resonance imaging obtained with ultra-high magnetic field scanners. This approach helps to advance these cutting-edge equipment towards global clinical applications for faster and more precise medical imaging.

Since its discovery in the early 70’s, MRI scanners have become one of the most efficient diagnostic tools available for physicians. Also, over time, their magnetic field strength has been steadily increased to enhance the Signal to Noise Ratio yielding a radical improvement of spatial and temporal resolution as well as biological contrast. On the other hand, such a strategy induces an increasing working frequency of the radio-frequency (RF) excitation field. It becomes problematic as human body size becomes non negligible compared with the associated wavelength. This induces strong RF field inhomogeneities leading to major losses in contrast or shadowing on the images and strongly limits the clinical application of High-Field MRI scanners.

The M-Cube project breakthrough is based on electromagnetic metamaterials offering an unprecedented ability to tailor RF field inside MRI coils. The interaction of electromagnetic modes within the metamaterial enables the access to the so-called Kerker scattering conditions leading to either a 3-fold enhancement of the local RF field or to be used as a local RF shield in order to protect over exposed body areas

Reference : “Kerker effect in ultrahigh-field magnetic resonance imaging” ; Marc Dubois, Lisa Leroi, Zo Raolison, Redha Abdeddaim, Tryfon Antonakakis, Julien de Rosny, Alexandre Vignaud, Pierre Sabouroux, Elodie Georget, Benoit Larrat, Gérard Tayeb, Nicolas Bonod, Alexis Amadon, Franck Mauconduit, Cyril Poupon, Denis Le Bihan, and Stefan Enoch ; Phys. Rev. X

DOI : https://doi.org/10.1103/PhysRevX.8.031083

Labs concerned by this article :
- Institut Fresnel
- Institut Langevin
- CEA NeuroSpin
- Multiwave

Contact Researcher : Redha Abdeddaim, Stefan Enoch et Marc Dubois

This work is part of the H2020 FET-Open M-Cube project. It has received funding from the European Union’s Horizon 2020 Research and Innovation program under Grant Agreement No 736937