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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