Multi-Band-Multi-Spoke pTX RF Pulse Design in the Heart at 7 Tesla: towards Faster, Uniform Contrast Cardiac CINE Imaging
Sebastian Schmitter 1 , Xiaoping Wu 1 , Steen Moeller 1 , Dingxin Wang 1,2 , Andreas Greiser 3 , Edward J. Auerbach 1 , Lance DelaBarre 1 , Pierre-Francois van de Moortele 1 , and Kamil Ugurbil 1
Center for Magnetic Resonance Research,
University of Minnesota, Minneapolis, MN, United States,
Medical Solutions USA, Inc., Minneapolis, MN, United
Healthcare Sector, Erlangen, Bavaria, Germany
Cardiac MRI may strongly benefit from ultra-high field
(UHF) providing higher SNR and intrinsic contrast.
However, shorter RF wavelength at UHF results in
heterogeneous contrast within the heart. This problem
has been successfully addressed with parallel
transmission (pTX) using 3D tailored RF excitation
('spokes'). Additionally, respiratory motion often
requires breath-hold examinations, which strongly limits
spatial coverage. Here we address simultaneously spatial
coverage and homogeneity by designing pTX spoke pulses
to simultaneously excite/acquire multiple slices
('Multi-Band') using a 16-channel pTX system. We
demonstrate successful cardiac CINE multiband
acquisitions for 2 slices at 7T and compare 1- and
2-spoke pulse performances.
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