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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