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Abstract #1752

Calibration of Siemens MAGNETOM(TM) Terra 7T Shim System and Analysis of Static 3rd-order B0-Shimming of the Heart Using B0DETOX

Michael Hock1, Maxim Terekhov1, David Lohr1, Maria Roxana Stefanescu1, Anja Schröder2, Heike Walles2, Christoph Juchem3, and Laura Maria Schreiber1

1Chair of Cellular and Molecular Imaging, Comprehensive Heart Failure Center (CHFC), University Hospital, Wuerzburg, Germany, 2Translational Center Regenerative Therapies (TLC-RT), Fraunhofer Institute for Silicate Research (ISC), Wuerzburg, Germany, 3Departments of Biomedical Engineering and Radiology, Columbia University, New York, NY, United States

Susceptibility-induced field inhomogeneities in both space and time make B0-shimming a prerequisite for cardiac MRI at ultra-high field. All individual terms of the static 3rd-order spherical harmonics shim system were calibrated. Field mapping and calculation of shim currents are performed in customized B0DETOX software. Analysis of B0-inhomogeneities is later tested both in measurement of an ex-vivo pig heart and in-vivo in humans. The adjustment of the shim volume to the three measured slices in a healthy volunteer reduced the standard deviation of the field map by 4%, 19% and 18% compared to shimming of the global heart.

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