Laura Sacolick1, Florian Wiesinger1, Schulte F. Rolf1, Dong Chen1, Guido Kudielka1, Wolfgang Loew1, Mika W. Vogel1
1Imaging Technologies, GE Global Research, Munich, Bavaria, Germany
The majority of applications thus far for parallel RF transmission in MRI have focused on addressing problems of B1 homogeneity. Here an eight-channel parallel transmit system is demonstrated for a novel application in reducing scan time as well as SAR. The multiple transmit channels are used to produce RF pulses simultaneously at multiple carrier frequencies. These are used to excite and simultaneously acquire four slices, which are then reconstructed by SENSE. The rungs of a body TEM coil assigned to excite each slice are chosen to minimize SAR, and are phase shimmed to maximize B1 field homogeneity. Multi-frequency parallel transmit is used here to give significant scan acceleration that can be combined with multiple receive coil acceleration, and applied in a wide variety of applications.