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Abstract #2504

Fast Simultaneous B0/B1 Mapping by Bloch-Siegert Shift with Improved Gradient Scheme and Pulse Design

Qi Duan1, Peter van Gelderen1, Jeff H. Duyn1

1Advanced MRI section, LFMI, NINDS, National Institutes of Health, Bethesda, MD, United States

This abstract investigates fast simultaneous B0/B1 mapping by Bloch-Siegert shift. Based on investigation of the source of the SAR limitation, it proposes several modifications from the original scheme to reduce such limitation while maintaining same sensitivity to the B1 field. Simultaneous B0 mapping is added into the sequence to further improve the accuracy by compensating the increased B0 sensitivity due to reduced frequency offset. The newly proposed scheme is compared to the original scheme both via simulation and in vivo demonstration.