File(s) under permanent embargo
Computing Lorentz forces generated by gradient coils in an open MRI system
journal contribution
posted on 2023-05-16, 21:29 authored by Michael BridesonMichael Brideson, Jackson, JM, Lawrence ForbesLawrence Forbes, Crozier, SMagnetic Resonance Imaging requires the use of gradient coils to perturb the main homogeneous static magnetic field. Sequential perturbations in each of the orthogonal cartesian directions results in the magnetic field becoming spatially encoded. The fast switching of the gradient coils produces large Lorentz forces which act on the coils. These unwanted forces dissipate as acoustic noise at sound pressure levels upward of 130dB. We present a method for designing open magnetic resonance imaging coils that produce reduced Lorentz forces whilst still producing highly accurate gradient fields. We show that when gradient fields of approximately 1% are considered, a linearised regularisation solves for the Fourier series coefficients.
History
Publication title
ANZIAM JournalVolume
49Pagination
C423-C438ISSN
1446-1811Department/School
School of Natural SciencesPublisher
Cambridge University PressPlace of publication
Cambridge, EnglandRights statement
Copyright © 2008 Australian Mathematical SocietyRepository Status
- Restricted