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. Raaijmakers^1,3

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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