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Abstract #2674

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

Ana Luisa Neves1,2, 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 εr, 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 (εr =470) and tested in a 7T MRI, as well as a conventional saturated pad (≈40%v/v, εr=200). Results show an overall signal improvement when using higher permittivity pads and the possibility to reduce pad-thickness.

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