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Abstract #3141

Successful 2-Spoke pTX RF Pulse excitation using a single-channel transmit 7T console retrofitted with a 16-channel B1 Shimming unit

Sebastian Schmitter 1 , Xiaoping Wu 1 , Edward John Auerbach 1 , Lance DelaBarre 1 , Gregor Adriany 1 , Kamil Ugurbil 1 , and Pierre-Francois Van de Moortele 1

1 Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States

Transmit B1 inhomogeneity, a significant challenge at ultra-high fields, has previously been addressed using spokes and kt-pulses applied with prototype parallel transmission (pTX) systems. However, since the phase/gain setting during a single spoke (or kt-point) is kept constant, a pTX system is not required. Instead, a less expensive dynamic B1+ shimming system, capable of switching fast enough the shim sets between the sub-pulses, may also be used. In this work we demonstrate the feasibility of applying 2-spoke pulses to two different targets at 7T using a dynamic B1+ shimming system: slab-selective TOF angiography and slice-selective cardiac MRI.

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