Abstract #2397
SAR reduced excitation by joint design of RF pulse and slice selective gradient shape
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
Radio frequency (RF) pulses are essential in MRI to
excite and alter magnetization. We present a flexible
approach based on optimal control of the full
time-dependent Bloch equation for joint optimization of
RF pulse and slice selective gradient. A globally
convergent trust-region Newton method with exact
derivatives via adjoint calculus allows the efficient
computation of optimal pulses. The results are validated
on a 3T scanner and demonstrate the ability to generate
optimized waveforms for large flip angles with highly
reduced RF power.
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