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Abstract #4436

Asymmetric Two-Dimensional Spatially Selective Excitation in Echo-Planar Imaging

Rainer Schneider 1,2 , Jens Haueisen 2 , and Josef Pfeuffer 1

1 MR Application Development, Siemens Healthcare, Erlangen, Bavaria, Germany, 2 Institute of Biomedical Engineering and Informatics, TU Ilmenau, Ilmenau, Thuringia, Germany

An asymmetric design is introduced to 2-D spatially selective radiofrequency (2DRF) pulses based on an echo-planar trajectory. The proposed design allows a significant reduction of pulse durations maintaining the excitation quality. This can be done independent of potential pulse accelerations with parallel transmission. Excitation quality with different asymmetry factors was analyzed in a phantom study. Asymmetric 2DRF pulses were evaluated in human diffusion-weighted experiments. Linked to the resulting TE savings, asymmetric 2DRF pulses offered SNR gains of up to 25% compared to the conventional 2DRF designs.

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