Abstract #2289
Slab-wise pulse design enhances the performance of dual source parallel RF transmission at 3T
Xiaoping Wu 1 , Dingxin Wang 1,2 , Jinfeng Tian 1 , Sebastian Schmitter 1 , Vibhas Deshpande 3 , Tommy Vaughan 1 , Kamil Ugurbil 1 , and Pierre-Francois Van de Moortele 1
1
CMRR, Radiology, University of Minnesota,
Minneapolis, MN, United States,
2
Siemens
Medical Solutions USA, Inc., Minneapolis, MN, United
States,
3
Siemens
Medical Solutions USA, Inc., Austin, TX, United States
Previous studies have demonstrated that the use of dual
source parallel RF transmission (pTx) is advantageous
over standard single source RF excitation in 3T body
imaging. In these studies a single RF shim set was
obtained for a multislice sequence to image the entire
region of interest and therefore the resulting pulses
are of suboptimal performance since the full degrees of
freedom (DOFs) available in the pulse design are not
utilized. Recently, a slab-wise pulse design strategy
was introduced to make maximum use of the DOFs in pulse
design and was demonstrated capable of providing
enhanced RF performance when designing pTx multiband
pulses. In this study, we utilize this slab-wise design
strategy to evaluate the performance of a 3T birdcage
body coil when operated in the dual transmit mode, and
compare it to the conventional single transmit
circularly polarized mode. RF shimming was conducted
with local SAR control based on electromagnetic
simulations of the birdcage coil.
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