Jens Hoffmann1, Juliane Budde1, Gunamony Shajan1, Rolf Pohmann1
1High Field Magnetic Resonance Center,
Max Planck Institute for Biological Cybernetics, Tuebingen,
In this work, we demonstrate B1 phase shimming in situ at 9.4 Tesla: A rapid calibration pre-scan provides B1+ magnitude and phase maps that are used to predict the total field across the subject dependent on a phase configuration of choice. In addition, a GUI provides the option to select a region within a slice where the field is quickly and reliably optimized by a simulated annealing algorithm based on a suitable optimization criterion. The accuracy of this method is demonstrated in a saline phantom and used for B1 shimming in the human brain.