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Communication Dans Un Congrès Année : 2018

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

Résumé

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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hal-02366402 , version 1 (15-11-2019)

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  • HAL Id : hal-02366402 , version 1

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Christopher B. Bidinosti, Pierre-Jean Nacher, Geneviève Tastevin. Unconventional trajectories on the Bloch Sphere: A closer look at the effects and consequences of the breakdown of the rotating wave approximation. Joint annual meeting ISMRM-ESMRMB 2018, Proc. of the Intl. Soc. Mag. Reson. Med., Jun 2018, Paris, France. pp.2701. ⟨hal-02366402⟩
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