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Abstract #2753

Direct Encoded Signal Control with Phase Distribution Graphs for readout-tailored multipulse pTx

Simon Weinmüller1, Jonathan Endres1, Peter Dawood1,2, Martin Freudensprung1, Felix Glang3, Armin M. Nagel4, and Moritz Zaiss1,5
1Institute of Neuroradiology, Universitätsklinikum Erlangen, Erlangen, Germany, 2Experimental Physics 5, University of Würzburg, Würzburg, Germany, 3Magnetic Resonance Center, Max Planck Institute for Biological Cybernetics, Tübirngen, Germany, 4Institute of Radiology, Universitätsklinikum Erlangen, Erlangen, Germany, 5Department Artificial Intelligence in Biomedical Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany

Synopsis

Keywords: Pulse Sequence Design, RF Pulse Design & Fields

Motivation: In high-field MR imaging the image quality suffers due to high transmit (B1+) inhomogeneities.

Goal(s): The primary goal was to enhance the B1+ shimming process by individually optimizing pulses for improved overall magnetization homogeneity, aiming for better reconstructed image quality without visible inhomogeneities.

Approach: This study used Phase Distribution Graphs (PDG) and the MR-zero framework for multi-coil transmit setups, optimizing shimming across each pulse and entire sequence.

Results: Simulations and in vivo measurements confirmed that the optimized sequences achieved superior homogeneity and image quality compared to traditional shim modes.

Impact: This approach enables more precise RF shimming for high-field MRI, improving image quality. It opens avenues for investigating optimized sequences across various readout strategies, reducing the need for manual tuning, which can enhance clinical and research imaging applications.

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