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Abstract #3546

On the robustness and reproducibility of spatially selective excitation using parallel transmission at 7T – a multicenter study

Maximilian N. Voelker1, Daniel Brenner2, Martina Flöser3, Marcel Gratz4,5, Soeren Johst4, Stephan Orzada4, Tony Stöcker2, Harald H. Quick4,6, Mark E. Ladd3,4, and Oliver Kraff4

1University of Essen, Erwin L. Hahn Institute for Magnetic Resonance Imaging, Essen, Germany, 2German Center for Neurodegenerative Diseases (DZNE), Bonn, Germany, 3Medical Physics in Radiology, German Cancer Research Center (dkfz), Heidelberg, Germany, 4Erwin L. Hahn Institute for Magnetic Resonance Imaging, University of Duisburg-Essen, Essen, Germany, 5High Field and Hybrid MR Imaging, University Hospital Essen, University of Duisburg-Essen, Essen, Germany, 6High Field and Hybrid MR Imaging, University Hospital Essen, University Duisburg-Essen, Essen, Germany

Parallel transmission (pTx) allows the excitation of arbitrarily shaped patterns or reduced field-of-view imaging and is of particular interest in ultra-high field MRI where it is used to diminish artifacts caused by B1 inhomogenities. However, calculation of arbitrarily shaped pulses is not included in standard pTx system procedures, is time consuming, and can only be done with knowledge of additionally acquired transmit B1 fields. To optimize this workflow, it might be advantageous to share pre-calculated pulses between different systems and/or coils. Image patterns were generated and optimized to assess image quality and to evaluate reproducibility and robustness of shared pulses.

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