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Abstract #0324

Evaluating Further Benefits of B1+ Homogenity When More Transmit Chnnels Are Used

Niravkumar Darji1, Kyoung-Nam Kim2, Gopesh Patel1, Hans-Peter Fautz3, Johannes Bernarding2, Oliver Speck1

1Biomedical Magnetic Resonance, Otto-von-Guericke University, Magdeburg, Saxony Anhalt, Germany; 2Institute for Biometry & Medicine Informatics, Otto-von-Guericke University, Magdeburg, Saxony Anhalt, Germany; 3 Siemens Healthcare, Erlangen, Germany

Human MR System equipped with a multi Tx hardware typically have a much smaller number of Tx channels than Receive (Rx) channels. The purpose of this study was to evaluate whether more of Tx channels could improve the Tx field performance. B1+ field inhomogeneity at 7T can be minimized to a certain level by varying the phase and amplitude of individual channels of the 16 channel transmit array. However, even with a larger number of channels, complex B1+ distributions cannot be corrected by means of static RF-shimming only. Transmit-SENSE with spoke trajectories may be more efficient in correcting inhomogeneities even with a lower number of channels.