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Abstract #2860

Slice-Selective Broadband Refocusing Pulses with B1 Immunity

Martin Janich1,2, Rolf F. Schulte2, Markus Schwaiger3, Steffen J. Glaser1

1Department of Chemistry, Technische Universitt Mnchen, Munich, Germany; 2Imaging Technologies, GE Global Research, Munich, Germany; 3Institute for Nuclear Medicine, Technische Universitt Mnchen, Munich, Germany

Broadband radio-frequency pulses are of great interest for reducing chemical shift displacements, anomalous J coupling, and increasing spectral selectivity. In this study broadband refocusing pulses with immunity to B 1 variations are designed using optimal control theory. The pulse design concentrates on posing least constrains on the optimization. The refocusing pulse presented here reaches a ratio of pulse bandwidth to peak RF amplitude of 2.1 and immunity of -10 % to +20 % B 1 variations. The optimized pulse is compared to a broadband SLR pulse, and validated experimentally.