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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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