2nd-order meander dipoles for 7T head coil passive RF shimming
Tania del Socorro Vergara Gomez1,2, Roxane Mamberti2, Marc Dubois3, Elodie Georget3, Tryfon Antonakakis3, Alexandre Vignaud4, 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, 4CEA, DRF/Joliot/Neurospin, Université Paris-Saclay & CNRS, Gif-sur-Yvette Cedex, France
Active and passive RF shimming approaches have been proposed to diminish the B1+ inhomogeneities commonly found in a birdcage coil at 7T. In a previous work, we have introduced a meander dipole based on two 3rd-order Hilbert fractals as an alternative solution for passive shimming. In this work we optimized their design using six 2nd-order Hilbert fractals. Simulations and in vivo MRI at 7T using these structures showed strong B1+ enhancement in the area between the two meander dipoles whereas B1+ was reduced in regions below and above the fractal pads.
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