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Abstract #2183

Actively coupled dielectric pads for adaptive B1+ field shimming

Paulina Šiurytė1, Friso de Boer1, Can Akgun2, and Sebastian Weingärtner1
1Imaging Physics, TU Delft, Delft, Netherlands, 2Microelectronics, TU Delft, Delft, Netherlands


MRI at high and ultra high field strengths suffers from B1+ inhomogeneities, but B1+ shimming with multiple transmit coils is only available at top-line scanners. Dielectric pads allow for localized B1+ changes, but need to be specifically designed for the scan and anatomy. In this work we explore the use of an actively switchable dielectric device to allow for spatial B1+ correction without the need for multiple transmit coils. Our phantom experiments at 3T show that coupling mini-pockets with barium titanate slurry enables various field configurations that are switchable, localized and significant in magnitude.

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