Alexis Amadon1, Nicolas Boulant1, Martijn Anton Cloos1, Eric Giacomini1, Christopher John Wiggins1, Michel Luong2, Guillaume Ferrand2, Hans-Peter Fautz3
1Neurospin, CEA/DSV/I2BM, Gif-sur-Yvette, France; 2IRFU, CEA/DSM, Gif-sur-Yvette, France; 3Siemens Healthcare, Erlangen, Germany
Efficient mitigation of the RF inhomogeneity using transmit coil arrays relies on the knowledge of the individual B1-maps. As the number of transmit channels increases, so does the acquisition time of all maps. Here we focus on a fast 2D sequence proposed by Fautz et al. which we adapt for multi-slice B1-mapping. We compare its results with that of the 3D AFI sequence on a spherical phantom surrounded by 8 transmit elements at 7T. We show comparable performance with a 12-fold increase in speed, making accurate B1-mapping of the human head feasible in 1.5 minutes for 8 transmit channels.