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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