Excitation Performance and SAR Control with Z-Stacked Body RF Coil Arrays in Parallel Transmission at 3T
Xiaotong Zhang 1 , Xiaoping Wu 2 , Jinfeng Tian 2 , Sebastian Schmitter 2 , Lance DelaBarre 2 , Michael Hamm 3 , Josef Pfeuffer 3 , Dingxin Wang 2,4 , Bin He 1,5 , Thomas Vaughan 2 , Kamil Ugurbil 2 , and Pierre-Francois Van de Moortele 2
Department of Biomedical Engineering,
University of Minnesota, Minneapolis, MN, United States,
for Magnetic Resonance Research, University of
Minnesota, Minneapolis, MN, United States,
Healthcare, MR Application Development, Erlangen,
Medical Solutions USA Inc, Minneapolis, MN, United
for Engineering in Medicine, University of Minnesota,
Minneapolis, MN, United States
A High Pass birdcage (32 rungs) driven on two quad ports
(1x2) and three TEM whole body arrays consisting of one
ring (1x8), 2 z-stacked rings (2x8) or 3 z-stacked rings
(3x8) of TEM elements (8 per ring) have been modeled.
Their performance in parallel transmission on spine and
brain+c-spine imaging has been evaluated, in which the
excitation fidelity, RF power, global SAR and peak
10gSAR are compared. RF Spoke placement impact is also
detailed for different coil designs.
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