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-k_z 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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