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Abstract #3962

Improved B0 mapping with universal parallel transmit pulses at 7 tesla

Jürgen Herrler1, Patrick Liebig2, Rene Gumbrecht2, Sydney Nicole Williams3, Christian Meixner4, Andreas Maier5, Arnd Dörfler1, and Armin Michael Nagel4
1Institue of Neuroradiology, University Hospital Erlangen, Erlangen, Germany, 2SIEMENS Healthineers, Erlangen, Germany, 3Imaging Centre of Excellence, University of Glasgow, Glasgow, Scotland, 4Institue of Radiology, University Hospital Erlangen, Erlangen, Germany, 5Friedrich Alexander University Erlangen Nürnberg, Erlangen, Germany

B0 mapping was performed with a circularly polarized pulse and with a non-selective universal parallel transmit (pTx) pulse. The pTx pulse showed improved homogeneity, which resulted in different B0 values, mainly present at tissue interfaces. Based on the two resulting B0 maps, patient specific B0 shimming was performed. Further, based on the two shimmed B0 maps, individually optimized pTx excitation and inversion pulses were designed for use in a 3D MPRAGE sequence. The pTx inversion pulse based on the B0 map, which itself used universal pTx pulse, achieved a reduction of B0 related artifacts in the frontal sinus region.

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