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Abstract #0646

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

1 Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States, 2 Siemens Medical Solutions USA, Inc., Minneapolis, MN, United States, 3 Siemens 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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