Z-segmentation of a transmit array head coil improves RF ramp pulse design at 7T

Abstract : In Time-Of-Flight sequences, ramp pulses such as TONE's are frequently used to compensate for thru-slab blood flow saturation in cerebral MRA. At Ultra High Field, fast-kz spokes in parallel transmission allow to mitigate B1 + heterogeneities in the slab selection process. Here we extend their use for TONE pulses and show improvement of the flip angle ramp fidelity with a homemade z-segmented head array in comparison to a purely azimuthally-distributed commercial coil.
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Gaël Saïb, Raphael Tomi-Tricot, Vincent Gras, Franck Mauconduit, Nicolas Boulant, et al.. Z-segmentation of a transmit array head coil improves RF ramp pulse design at 7T. Joint Annual Meeting ISMRM-ESMRMB 2018, Jun 2018, Paris, France. ⟨hal-01633707⟩

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