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Abstract #3694

Fully embedded parallel transmission: Stable performances using universal pulses with fast online customization

Jürgen Herrler1, Patrick Liebig2, Rene Gumbrecht2, Manuel Schmidt1, Michael Uder3, Andreas Maier4, Arnd Dörfler1, and Armin Nagel3,5
1Institute of Neuroradiology, University Hospital Erlangen, Erlangen, Germany, 2SIEMENS Healthineers, Erlangen, Germany, 3Institute of Radiology, University Hospital Erlangen, Erlangen, Germany, 4Friedrich Alexander University Erlangen Nürnberg, Erlangen, Germany, 5Institute of Medical Physics, Friedrich Alexander University Erlangen Nürnberg, Erlangen, Germany

To homogenize signals 7 Tesla MRI reliably and fast, a pTx pulse design process was established. Trajectory, energy regularisation parameter and universal pulse shapes were calculated by solving global optimization problems using a dataset of 12 subjects (B1+ profiles, B0, VOP). Pulse shaping is done online using the actual subject‘s data acquired during the sequence preparation phase which lasts about 90s. A fitting curve for SED is also provided which, combined with online calculated SED values, aims to use the full amount of tolerable SAR. Compared with the CP-Mode, the NRMSE could be substantially improved for all 36 volunteers.

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