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Abstract #4092

Passive RF shimming with fractal metasurfaces in a 7T head coil

Tania S. Vergara Gomez1,2, Marc Dubois1,2, Kaizad Rustomji3, Elodie Georget3, Tryfon Antonakakis3, Stanislas Rapacchi1, Frank Kober1, Stefan Enoch2, and Redha Abdeddaim2
1Aix Marseille Univ, CNRS, CRMBM, Marseille, France, 2Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France, 3Multiwave Imaging, Marseille, France

B1+ inhomogeneities in the temporal lobes of the brain are common while using a birdcage coil at 7T. Different passive RF shimming approaches have already targeted this problem, at the cost of decreasing the B1+ field in other important areas or being uncomfortable to the patient. Here, we present a new approach based on two resonant fractal metasurfaces printed on ultra-thin flexible substrate. We show that these resonators improve the B1+ field amplitude simultaneously in each temporal lobe without affecting the B1+ field amplitude in other parts of the brain.

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