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Abstract #4233

Understanding the axial crushing effects of numerous current paths at 7 Tesla

Erik Rutger Huijing1, Alexander Raaijmakers1,2, Dennis Klomp1, Jannie Wijnen1, and Alex Bhogal1
1Department of Radiology, University Medical Center Utrecht, Utrecht, Netherlands, 2Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands

MR spectroscopic images are often distorted by lipid signals in the skull. A crusher coil that generates a local magnetic field can suppress these signals, but a homogeneous crushing field is required. This work focusses on a solution for a homogeneous crushing field in the axial direction. It is shown through numerous tests with current patterns that wires circling the coil without any directioal component in the z-direction cause the most homogeneous crushing pattern. Currents in the z-direction should be compensated by a return current that cancels the magnetic field of the current.

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