Abstract #0906
Impact of third order shim coils on gradient-magnet interactions and gradient waveform fidelity
Nicolas Boulant1, Caroline Le Ster1, Alexis Amadon1, Guy Aubert2, Alexander Beckett3,4, Jean Belorgey2, Cédric Bonnelye1, Dario Bosch5,6, David Otto Brunner7, Guillaume Dilasser2, Olivier Dubois2, Philipp Ehses8, David Feinberg3,9, Sajjad Feizollah10, Vincent Gras1, Simon Gross7, Quentin Guihard2, Hervé Lannou2, Denis Le Bihan1, Franck Mauconduit1, Frédéric Molinié2, François Nunio2, Klaas Pruessmann11,12, Lionel Quettier2, Klaus Scheffler5,13, Tony Stöcker8, Christine Tardif10, Kamil Ugurbil14, Alexandre Vignaud1, An Vu15,16, and Xiaoping Wu14
1NeuroSpin, CEA, Gif sur Yvette, France, 2Irfu, CEA, Gif sur Yvette, France, 3Advanced MRI technologies, Sebastopol, CA, United States, 4Helen Wills Neuroscience institute, University of California, Berkeley, CA, United States, 5Department for biomedical Magnetic Resonance, University of Tübingen, Tuebingen, Germany, 6High-field MR center, Max Planck Institute for biological cybernetics, Tuebingen, Germany, 7Skope MRT, Zürich, Switzerland, 8DZNE, Bonn, Germany, 9Helen Wills Neuroscience institute, Universiy of California, Berkeley, CA, United States, 10Montreal Neurological Institute-Hospital, McGill University, Montreal, QC, Canada, 11ETH Zürich, Zürich, Switzerland, 12University of Zürich, Zürich, Switzerland, 13High field MR center, Max Planck Institute for biological cybernetics, Tuebingen, Germany, 14Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States, 15University of California, San Francisco, CA, United States, 16San Francisco VA Health Care System, San Francisco, CA, United States
Synopsis
Keywords: Gradients, Gradients
Motivation: Third order shim coils can impact gradient-magnet interactions with consequences on image quality and magnet safety.
Goal(s): To demonstrate the influence of third order shim coils on the SC72 gradient coil using field and vibration measurements.
Approach: The gradient transfer function was measured at 11.7T (Iseult) and at 7T (Terra) with and without connection of the 3rd order shim coils. Vibration measurements were carried out on Iseult from 0 to 11.7T in the two configurations as well.
Results: The data demonstrate a drastic influence of the 3rd order shim coils and their circuits.
Impact: The work suggests caution when using third order shim coils at 7T and above. It also paves the way for further investigations to improve gradient waveform fidelity.
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