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Abstract #0944

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

1 INM-4, Forschungszentrum Jlich, Jlich, Germany, 2 Department 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 volume.

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