A region growing algorithm for robust kt-points B1+ homogenisation at 9.4T
Michael Stephen Poole 1 , Desmond H Y Tse 1 , Kaveh Vahedipour 1 , and N Jon Shah 1,2
INM-4, Forschungszentrum Jlich, Jlich,
of Neurology, RWTH Aachen University, Aachen, Germany
B1+ homogenisation was performed at 9.4 T repeatably and
robustly using kt-points and a region-growing algorithm
in a PBS phantom, an ex vivo human brain and in vivo.
DREAM was used to obtain B1+ maps of 8 parallel
transmitters. Small tip-angle gradient echo images were
aquired. We hypothesise that there exists a smooth
continuum from the small region solution (essentially
transmitter phase coherence in the centre) to the
globally optimum solution for the full homogenisation
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