Abstract #0918
A parallel transmit spectral-spatial pulse design method for ultra-high field MRS combining LSQR and optimal control based optimization
Tingting Shao 1 , Yun Zhang 2 , Nikolai Avdievich 1 , Steffen Glaser 2 , and Anke Henning 1,3
1
Max Planck Institute for Biological
Cybernetics, Tbingen, Baden-Wrttemberg, Germany,
2
Department
of Chemistry, Technical University of Munich, Garching,
Germany,
3
Institute
for Biomedical Engineering, UZH and ETH Zurich, Zurich,
Switzerland
This work presents a new spectral-spatial (SPSP)
parallel transmit pulse design method for 1H MRS
applications in ultra-high field MRI. Based on the
recently developed parallel transmission technology, the
pulse is first designed by using a subspace
preconditioned LSQR method in purpose of locating a
global minimum, and is afterwards optimized by using a
quasi-Newton based optimal control (OC) method to find a
local minimum answer. By combining these two algorithms
in this way, SPSP pulses that offer increased robustness
against B1+ inhomogeneity and minimized chemical shift
displacement artifacts can be achieved and therefore
adopted in MRS applications.
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