The possible influence of third-order shim coils on gradient–magnet interactions: an inter-field and inter-site study

• DOI: 10.1007/s10334-023-01138-3
• Publication Date: 2024-01-10T11:02:26Z
• Authors: Nicolas Boulant; Caroline Le Ster; Alexis Amadon; Guy Aubert; Alexander Beckett; Jean Belorgey; Cédric Bonnelye; Dario Bosch; David Otto Brunner; Guillaume Dilasser; Olivier Dubois; Philipp Ehses; David Feinberg; Sajjad Feizollah; Vincent Gras; Simon Gross; Quentin Guihard; Hervé Lannou; Denis Le Bihan; Franck Mauconduit; Frédéric Molinié; François Nunio; Klaas Pruessmann; Lionel Quettier; Klaus Scheffler; Tony Stöcker; Christine Tardif; Kamil Ugurbil; Alexandre Vignaud; An Vu; Xiaoping Wu
• Keywords: Shim (computing)

Abstract Objective To assess the possible influence of third-order shim coils on behavior gradient field and in gradient–magnet interactions at 7 T above. Materials methods Gradient impulse response function measurements were performed 5 sites spanning strengths from to 11.7 T, all them sharing same exact whole-body coil design. Mechanical fixation boundary conditions altered several ways one site study impact mechanical coupling with magnet perturbations. Vibrations, power deposition He bath, dynamics characterized connected disconnected inside Faraday cage. Results For design, differed greatly based configuration (connected or not). Vibrations transfer peaks could be affected by a factor 2 more, depending resonances. Disconnecting also suppressed almost completely some frequencies. Discussion Third-order configurations can have major consequences potential hardware damage, heating, image quality going beyond EPI acquisitions.