Abstract #1833

Improvements from local B0 shimming for QSM at 7 Tesla

Sina Straub¹, Mark E. Ladd^1,2, Paul Chang³, and Sahar Nassirpour³

¹Division of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, ²Faculty of Physics and Astronomy, Faculty of Medicine, University of Heidelberg, Heidelberg, Germany, ³MR Shim GmbH, Reutlingen, Germany

A 14-channel local array of shim coils was used to improve B₀homogeneity and reduce artifacts in quantitative susceptibility mapping at 7T. Using the local array of shim coils in addition to the standard 2nd order spherical harmonic shims, the B₀ shim quality was improved by an average of 16% across all volunteers. Local inhomogeneities were significantly reduced and could be correlated to reduced artifacts in QSM.

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