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Abstract #0915

RF pulse design for simultaneous multislice excitation with highly reduced B1 peak amplitude

Christoph Stefan Aigner 1 , Christian Clason 2 , Armin Rund 3 , and Rudolf Stollberger 1

1 Institute of Medical Engineering, Graz University of Technology, Graz, Austria, 2 Faculty of Mathematics, University of Duisburg-Essen, Essen, Germany, 3 Institute for Mathematics and Scientific Computing, University of Graz, Graz, Austria

RF pulses for simultaneous multislice excitation (SMS) are used to speed up imaging but typically lead to a linear increase of the B1 peak amplitude with the number of slices. We present a flexible design approach based on the optimal control of the full time-dependent Bloch equations and its application to the design of linear phase and low peak-B1 pulses for SMS excitation. We validate the numerical simulations with phantom experiments and show by using a CAIPIRINHA based excitation pattern and a slice GRAPPA reconstruction that our approach is applicable for in vivo experiments.

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