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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