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Globally optimal, minimum stored energy, double‐doughnut superconducting magnets
Author(s) -
Tieng Quang M.,
Vegh Viktor,
Brereton Ian M.
Publication year - 2010
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.22189
Subject(s) - magnet , electromagnetic coil , superconducting magnet , field (mathematics) , magnetic field , energy (signal processing) , field strength , physics , nuclear magnetic resonance , computer science , acoustics , mathematics , quantum mechanics , pure mathematics
The use of the minimum stored energy current density map–based methodology of designing closed‐bore symmetric superconducting magnets was described recently. The technique is further developed to cater for the design of interventional‐type MRI systems, and in particular open symmetric magnets of the double‐doughnut configuration. This extends the work to multiple magnet domain configurations. The use of double‐doughnut magnets in MRI scanners has previously been hindered by the ability to deliver strong magnetic fields over a sufficiently large volume appropriate for imaging, essentially limiting spatial resolution, signal‐to‐noise ratio, and field of view. The requirement of dedicated interventional space restricts the manner in which the coils can be arranged and placed. The minimum stored energy optimal coil arrangement ensures that the field strength is maximized over a specific region of imaging. The design method yields open, dual‐domain magnets capable of delivering greater field strengths than those used prior to this work, and at the same time it provides an increase in the field‐of‐view volume. Simulation results are provided for 1‐T double‐doughnut magnets with at least a 50‐cm 1‐ppm (parts per million) field of view and 0.7‐m gap between the two doughnuts. Magn Reson Med, 2010. © 2009 Wiley‐Liss, Inc.