kT-spokes: combining kT-points with spokes to ease ramp pulse design for TOF slab selection with parallel transmission at 7T

Abstract : TONE pulses counteract blood saturation through the imaged slab in TOF sequences, but their ramp profile is hampered by RF inhomogeneities at UHF. On the other hand, kz-spokes are known to compensate for in-plane B1 + heterogeneities in slice or slab selection. However, their design doesn't address thru-slab heterogeneities. To address them, a new pulse type called " kT-spokes " is introduced. As TONE pulses, kT-spokes efficacy is demonstrated with pTx at 7T in comparison with mere equivalent kz-spokes.
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Gaël Saïb, Vincent Gras, Franck Mauconduit, Alexandre Vignaud, Denis Le Bihan, et al.. kT-spokes: combining kT-points with spokes to ease ramp pulse design for TOF slab selection with parallel transmission at 7T. Joint Annual Meeting ISMRM-ESMRMB 2018, Jun 2018, Paris, France. ⟨hal-01633716⟩

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