Abstract #3531

B1+ homogenization at 7T using an innovative meta-atom

Lisa Leroi¹, Alexandre Vignaud¹, Pierre Sabouroux², Elodie Georget¹, Benoit Larrat¹, Stefan Enoch², Gérard Tayeb², Nicolas Bonod², Alexis Amadon¹, Denis Le Bihan¹, and Redha Abdeddaïm²

¹UNIRS, CEA Saclay - DSV - I2BM - Neurospin - UNIRS, Gif-sur-Yvette, France, ²CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249, Marseille, France

B₁⁺ heterogeneity at ultra-high field (UHF) can be tackled performing “passive shimming” with High-Dielectric Constant (HDC) pads. Nevertheless, HDC pads have shown structural, manufacturing and composition constraints. Here, we substitute HDC padding with a new meta-atom (MA) structure with a high equivalent dielectric constant, leaving behind the identified limitations. In this work, we compare this MA structure to a classic BaTiO₃ pad used in UHF clinical routine. Results demonstrate this solution to strongly impact local B₁⁺ distribution. Implementing multiple MA structures into the coil design might suggest a good potential for brain global B₁⁺ inhomogeneity mitigation.

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