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Abstract #3108

Designing a high-density combined RF/B0 shim coil for imaging the brain at 7T

Paul Chang1, Sahar Nassirpour1, Kaizad Rustomji2, Elodie Georget2, Ingmar Voogt3, Aidin Haghnejad3, Evita Wiegers4, Jannie Wijnen4, and Dennis Klomp4
1MR Shim GmbH, Reutlingen, Germany, 2Multiwave Imaging, Marseille, France, 3WaveTronica, Utrecht, Netherlands, 4UMC Utrecht, Utrecht, Netherlands

Increased B0 inhomogeneity at ultra-high fields continues to pose a challenge for many MR applications. Local arrays of shim coils offer a complimentary way of reducing the local inhomogeneities. In this study, practical design considerations for a combined RF/B0 shim 7T head coil were assessed. Numerical simulations were used to find the optimal size and distance of the shim coils relative to Rx loops. These results were then verified in a bench test. Finally, having these considerations in mind, it was shown that by optimizing the arrangement of the shim coils improved B0 homogeneity can be achieved.

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