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Abstract #3916

DREAM-based B1-shimming for cardiac imaging at 7 T

Bart R. Steensma1, Ingmar Voogt1, Luijten R. Peter1, Tim Leiner1, Dennis W.J. Klomp1, van den Berg A.T. Nico2, and Alexander J.E. Raaijmakers1,3

1Division Imaging, Department of Radiology, University Medical Center Utrecht, Utrecht, Netherlands, 2Division Imaging, Department of Radiotherapy, University Medical Center Utrecht, Utrecht, Netherlands, 3Biomedical Image Analysis, Eindhoven University of Technology, Eindhoven, Netherlands

RF shimming for multi-transmit systems is commonly performed by phase-only shimming. Improved B1+ homogeneity is reached by phase-amplitude shimming but this requires knowledge of the B1+ magnitude distributions. For cardiac imaging at 7 Tesla, the acquisition of these distributions is challenging. We present a DREAM-based acquisition series to reconstruct B1+ magnitude maps in the heart. This method is applied to homogenize the transmit field for three subjects using phase-amplitude shimming. Results demonstrate a clear improvement of transmit field homogeneity in the heart in comparison to phase-only shimming without B1+ magnitude information.

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