Abstract #4205

B0 shimming for X-nuclei imaging at 7 T using 23Na B0 maps

Lena V. Gast¹, Anke Henning², Bernhard Hensel³, Michael Uder¹, and Armin M. Nagel^1,4

¹Institute of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany, ²Max Planck Institute for Biological Cybernetics, Tübingen, Germany, ³Center for Medical Physics and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany, ⁴Division of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany

B₀ inhomogeneities are a major challenge at ultra-high magnetic field strengths (B₀ ≥ 7 T), as they can lead to strong image artifacts. In this work, a B₀shimming routine that is based on ²³Na B₀ maps was implemented for applications in X-nuclei imaging where no ¹H MRI data can be acquired and therefore, no vendor-provided shimming routines can be used. The proposed ²³Na ConsTru shimming routine showed an improvement in B₀ homogeneity comparable to the vendor-provided GRE Brain shimming routine both in phantom and in vivo measurements using ²³Na B₀ map acquisition times less than 1 minute.

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