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.