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Abstract #3201

Towards routine application of dynamic parallel transmission for whole-brain imaging at 9.4 Tesla

Jens Hoffmann 1,2 , G. Shajan 1 , Christian Mirkes 1,3 , Tingting Shao 1 , Anke Henning 1,4 , Rolf Pohmann 1 , and Klaus Scheffler 1,3

1 High-Field Magnetic Resonance Center, Max Planck Institute for Biological Cybernetics, Tuebingen, Germany, 2 Graduate School of Neural & Behavioural Sciences, Tuebingen, Germany, 3 Department for Biomedical Magnetic Resonance, University of Tuebingen, Germany, 4 Institute for Biomedical Engineering, University and ETH Zurich, Switzerland

The requirements for implementing a multi-purpose, pTx-enabled RF setup for whole-brain imaging at 9.4 Tesla are high. They include transmit arrays with sensitivities distributed in all dimensions, receive hardware for high-SNR parallel signal reception, numerical simulations for compliance with SAR limits as well as rapid, volumetric calibration scans. In this work, we report our progress in achieving these objectives. A 16-channel dual-row Tx / 31-channel Rx-array combination was interfaced to an 8-channel pTx system. SAR was evaluated numerically, rapid calibration scans were acquired using a 3D DREAM sequence and superior excitation quality using Spokes pulses is demonstrated in vivo.

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