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Abstract #4270

Fast Isotropic Volumetric B1+ Calibration Improves RF Shimming in Abdominal MRI at 3T

Alois M. Sprinkart1, 2, Georg Schmitz2, Frank Trber1, Wolfgang Block1, Jrgen Gieseke3, Winfried A. Willinek1, Hans H. Schild1, Peter Brnert4, Kay Nehrke4

1Dept. of Radiology, University of Bonn, Bonn, Germany; 2Institute of Medical Engineering, Ruhr-University Bochum, Bochum, Germany; 3Philips Healthcare, Hamburg, Germany; 4Philips Research Laboratory, Hamburg, Germany

The recently published ultra-fast B1+ mapping approach DREAM was used to acquire an volumetric B1+ calibration dataset of the whole upper abdomen with an isotropic voxel size of 4.7mm within a single breath-hold acquisition in 12 patients and 2 volunteers at 3T. Based on this data RF settings were optimized separately for each of 60 transversal and 40 coronal reformatted slices, adaptive to position and angulations to evaluate potential improvements in flip angle accuracy and B1+ homogeneity by multi-slice adapative RF shimming. Results were compared to conventional transversal single-slice optimization approach.