Influence of 2-spoke pulses k-space placement in different optimization strategies and cost functions
Laura Dupas 1 , Alexis Amadon 1 , Aurlien Massire 1 , Alexandre Vignaud 1 , and Nicolas Boulant 1
NeuroSpin, CEA, Saclay, Ile de France,
The impact of 2-spoke k-space placement is investigated
for different pulse performance metrics and algorithms
(under strict SAR and power constraints): the Least
Squares problem with the Active-Set (AS) algorithm, the
Magnitude Least Squares (MLS) problem with the
Variable-Exchange method and the MLS problem with AS.
After demonstrating that the MLS cost-function depends
only on the vector between the two spokes in the small
tip angle approximation, numerical simulations with in
vivo data acquired at 7T on a human brain show that RF
pulse performance is excellent and robust over
surprisingly large regions of k-space.
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