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Abstract #3398

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

Gaël Saïb1, Raphaël Tomi-Tricot1, Franck Mauconduit2, Vincent Gras1, Nicolas Boulant1, Alexandre Vignaud1, Edouard Chazel1, Eric Giacomini1, Guillaume Ferrand3, Michel Luong3, Denis Le Bihan1, Laurent Le Brusquet4, and Alexis Amadon1

1CEA/DRF/Joliot/NeuroSpin/UNIRS, Gif-sur-Yvette, France, 2Siemens Healthineers France, Saint-Denis, France, 3CEA/DRF/IRFU/DACM, Gif-sur-Yvette, France, 4Laboratoire des Signaux et Systèmes, Université Paris-Saclay/CentraleSupélec/CNRS, Gif-sur-Yvette, France

In Time-Of-Flight sequences, ramp pulses such as TONE are frequently used to compensate for thru-slab blood saturation in cerebral MRA. At Ultra High Field, parallel transmit fast-kz spokes can be used to greatly mitigate B1+ heterogeneities in the slab selection process. Here we use this technique to design TONE pulses with improved flip angle ramp fidelity and compare the performance achieved with a homemade z-segmented head coil versus a non-segmented commercial array.

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