Abstract #2674

Optimization via Ultra-high Permittivity Materials of Pad Effects in Dielectric Shimming at 7 Tesla MRI

Ana Luisa Neves^1,2, Redha Abdeddaim¹, Stefan Enoch¹, Jerome Wenger¹, Johann Berthelot¹, Anne-Lise Adenot-Engelvin³, Nicolas Mallejac³, Franck Mauconduit⁴, Lisa Leroi⁵, Alexandre Vignaud⁵, and Pierre Sabouroux¹

¹Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France, ²Centre Commun de Resources en Micro-ondes, Marseille, France, ³CEA-DAM Le Ripault, Monts F-37260, France, ⁴Siemens Healthineers, Saint Denis, France, ⁵CEA, DRF, i2BM, NeuroSpin, UNIRS, Paris-Saclay University, Gif-sur-Yvette, France

The influence of air fraction on the permittivity of BaTiO₃ aqueous mixtures was assessed, with the aim of obtaining high permittivity mixtures. For extremely saturated mixtures (>50%v/v), the air fraction of the mixture plays a great role in determining ε_r, and by applying high pressure it is possible to go beyond the maximal value described in dielectric shimming literature. A BaTiO₃ 1cm-thick pad was manufactured (ε_r=470) and tested in a 7T MRI, as well as a conventional saturated pad (≈40%v/v, ε_r=200). Results show an overall signal improvement when using higher permittivity pads and the possibility to reduce pad-thickness.

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