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 Gratz^4,5, Soeren Johst⁴, Stephan Orzada⁴, Tony Stöcker², Harald H. Quick^4,6, Mark E. Ladd^3,4, 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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