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Abstract #3455

2D Composite Pulses: A Novel Method for Spatially Selective Excitation

Rene Gumbrecht1, 2, Hans-Peter Fautz1

1Siemens Healthcare, Erlangen, Germany; 2Department of Physics, University of Erlangen, Erlangen, Germany

The power of 2D selective RF pulses is to excite any spatial pattern within the field of view. However, the length of these pulses causes artifacts that especially affect background suppression. It can be observed that conventional 1D slice selective RF pulses have a superior sharpness and background suppression compared to 2D selective pulses. The goal of this study is to transfer these qualities of a 1D slice selective RF pulse to a 2D selective excitation

Keywords

accelerate achieved advantages alternating amplitude anything applying array artifacts availability available background band bandwidth called capabilities capable channel commercially composite concatenated consider considered consist correspondingly create created creates days defined depending design designed despite details development deviation diagram diamond dimensional distribution distributions earlier early either else ensured equations equipped especially excitation excitations excite excited fidelity field find form frequency full furthermore future good gradient gradients head human idea implementation inner intersection introduced known length limited linear made magnetization maps measured modeled need never novel optimal optimization optimize orthogonal outside overlap parallel peak phantom physics problem procedure product profiles progress promising proposed providing pulse pulses qualities rectangular reduced rely routine sampling schematic scheme selecting selection selective selectively sets several shape shapes shimmed simulating slab slabs slice solver space sparse spatial spatially sphere steepness still suppress suppressed suppression target took trajectories trajectory transfer transition transmission transmit typical underlying view water wide zero zoomed