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Abstract #2701

Unconventional trajectories on the Bloch Sphere:  A closer look at the effects and consequences of the breakdown of the rotating wave approximation

Christopher Bidinosti1, Pierre-Jean Nacher2, and Geneviève Tastevin2

1Physics, University of Winnipeg, Winnipeg, MB, Canada, 2Laboratoire Kastler Brossel, ENS-PSL Research University, Paris, France

TRASE MRI uses rapid π-pulses of phase gradient fields, and in general requires as many as two distinct phase-gradient coils per encoding direction. This tends to restrict one to large amplitude, linear B1 fields, which in low B0 field leads to a breakdown of the rotating wave approximation. We have studied this regime both numerically and experimentally. Our results show a rich behavior involving a complex interplay of the Bloch-Siegert shift, the B1 start and stop phase, and B1 amplitude transients.

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