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Abstract #3701

Sub-µs gradient delay correction in tilted slab-selective bipolar multi-spoke RF pulses using trim blips

Redouane Jamil1, Vincent Gras1, Franck Mauconduit1, and Nicolas Boulant1
1CEA, Université Paris-Saclay, NeuroSpin, Gif sur Yvette, France

Bipolar spokes RF pulses can be employed in parallel transmission (pTX) used to mitigate the RF field inhomogeneity problem at ultra-high field in 2D. However, their performance can dramatically drop with delays between gradients and RF pulses. This work reports a new method for (anisotropic) gradient delay correction for multi-spoke RF pulses based on so-called gradient trim blips, applicable to tilted slice and slab excitations. This solution has been tested in Bloch simulation and validated on phantom at 7T with tilted slab-selective pulses. Experimental results obtained with the corrected pulses match the simulations incorporating no gradient delay.

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