Abstract #1019

RF Shimming for High Field MRI using Multi-channel Receive-Signals

Abhinav V. Sambasivan¹, Lance DelaBarre², Emad S. Ebbini¹, Thomas J. Vaughan^1,2, and Anand Gopinath¹

¹Electrical and Computer Engineering, University of Minnesota-Twin Cities, Minneapolis, MN, United States, ²Center for Magnetic Resonance Research, UMN-Twin Cities, Minneapolis, MN, United States

Counteracting the effects of B₁ heterogeneities has been a major challenge for High field MRI systems. We propose here, a receiver-based approach called the Receive-RF Shimming (Rx-RFS) algorithm for multichannel MR systems which offers potential advantages in terms of reducing image acquisition time and mitigating SAR concerns. RX-RFS involves computing an optimal spatially-varying weight vector for combining the images from different receive elements. The reconstructed images (using Rx-RFS) exhibit enhanced contrast and more uniform signal levels when compared to standard reconstruction schemes throughout the entire Field-of-View. Rx-RFS also offers clinicians the flexibility to obtain local reconstructions at arbitrary Regions-of-Interest.

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