Design of sparse Halbach magnet arrays for portable MRI using a genetic algorithm

IEEE Transactions on Magnetics
Clarissa Zimmerman CooleyLawrence L Wald

Abstract

Permanent magnet arrays offer several attributes attractive for the development of a low-cost portable MRI scanner for brain imaging. They offer the potential for a relatively lightweight, low to mid-field system with no cryogenics, a small fringe field, and no electrical power requirements or heat dissipation needs. The cylindrical Halbach array, however, requires external shimming or mechanical adjustments to produce B0 fields with standard MRI homogeneity levels (e.g., 0.1 ppm over FOV), particularly when constrained or truncated geometries are needed, such as a head-only magnet where the magnet length is constrained by the shoulders. For portable scanners using rotation of the magnet for spatial encoding with generalized projections, the spatial pattern of the field is important since it acts as the encoding field. In either a static or rotating magnet, it will be important to be able to optimize the field pattern of cylindrical Halbach arrays in a way that retains construction simplicity. To achieve this, we present a method for designing an optimized cylindrical Halbach magnet using the genetic algorithm to achieve either homogeneity (for standard MRI applications) or a favorable spatial encoding field pattern (for rotati...Continue Reading

Citations

May 5, 2020·Magnetic Resonance in Chemistry : MRC·William G LeeMark J Milton
Jul 7, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Thomas O'ReillyAndrew G Webb
Oct 13, 2019·Journal of Magnetic Resonance Imaging : JMRI·Lawrence L WaldClarissa Zimmerman Cooley
Nov 25, 2020·Nature Biomedical Engineering·Clarissa Z CooleyLawrence L Wald
Nov 4, 2020·The Review of Scientific Instruments·A Bogaychuk, V Kuzmin
Mar 8, 2021·The Lancet Oncology·Hedvig HricakAndrew M Scott
Mar 30, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Michael Mullen, Michael Garwood
Apr 25, 2021·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·C D E Van SpeybroeckA G Webb
Sep 15, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Thomas O'Reilly, Andrew G Webb

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