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Abstract #4337

Ultra-fast B 1 + Mapping allows Speeding up RF Shimming in Body MRI at 3T

Alois Martin Sprinkart 1,2 , Georg Schmitz 2 , Frank Trber 1 , Wolfgang Block 1 , Jrgen Gieseke 3 , Hans Schild 1 , Peter Brnert 4,5 , and Kay Nehrke 4

1 Dept. of Radiology, University of Bonn, Bonn, Germany, 2 Institute of Medical Engineering, Ruhr-University Bochum, Bochum, Germany, 3 Philips Healthcare, Hamburg, Germany, 4 Philips Research Laboratory, Hamburg, Germany, 5 Dept. of Radiology, LUMC, Leiden, Netherlands

To test if the recently proposed ultra-fast B 1 + mapping approach DREAM is applicable in clinical routine for patient-adaptive radiofrequency(RF)-shimming in body MRI at 3T, the performance of DREAM, double-angle (DA), and actual-flip-angle (AFI) B 1 + mapping methods was compared in 10 volunteers. Therefore, RF-shimsets obtained by DA-, AFI-, and DREAM- based B 1 + calibration data were analyzed by AFI- based B 1 + mapping. Results suggest that DREAM-based RF-shimming yields similar results as DA and AFI with respect to both, flip angle accuracy and B 1 + homogeneity, while the total acquisition time of the calibration sequence is shortened from one or two long breath-holds to about 1 second when DREAM is applied.

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