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Abstract #4333

Slab-wise parallel transmit multiband RF pulse design for simultaneous multislice imaging with volumetric coverage

Xiaoping Wu 1 , Sebastian Schmitter 1 , Kamil Ugurbil 1 , and Pierre-Francois Van de Moortele 1

1 CMRR, Radiology, University of Minnesota, Minneapolis, Minnesota, United States

Simultaneous MultiSlice (SMS) MR imaging using MultiBand (MB) RF pulses is playing an increasingly important role in neuroimaging. Recently, we have proposed a slice-wise parallel transmit (pTx) MB pulse design that can be used to improve transmit B1 homogeneity and/or reduce RF power consumption relative to a single channel Circular Polarized mode application. However, directly utilizing this slice-wise approach and designing pTx MB pulses in a slice-by-slice fashion for all necessary imaging slices for covering a large volume of interest, such as the whole brain, is impractical within clinical time constraints with current instrumentation, especially when using high through-plane spatial resolutions. In the present study, we propose a novel, effective and practical slab-wise pTx MB pulse design targeting volumetric coverage in SMS/MB imaging and describe some of its important properties by designing RF pulses based on electromagnetic modeling of a head array at 7T.

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