Minimax current density gradient coils: analysis of coil performance and heating

Poole, Michael S., While, Peter T., Sanchez Lopez, Hector and Crozier, Stuart (2012) Minimax current density gradient coils: analysis of coil performance and heating. Magnetic Resonance in Medicine, 68 2: 639-648. doi:10.1002/mrm.23248

Author Poole, Michael S.
While, Peter T.
Sanchez Lopez, Hector
Crozier, Stuart
Title Minimax current density gradient coils: analysis of coil performance and heating
Journal name Magnetic Resonance in Medicine   Check publisher's open access policy
ISSN 0740-3194
Publication date 2012-08
Sub-type Article (original research)
DOI 10.1002/mrm.23248
Volume 68
Issue 2
Start page 639
End page 648
Total pages 10
Place of publication Hoboken NJ, United States
Publisher John Wiley and Sons
Collection year 2013
Language eng
Formatted abstract
Standard gradient coils are designed by minimizing the inductance or resistance for an acceptable level of gradient field nonlinearity. Recently, a new method was proposed to minimize the maximum value of the current density in a coil additionally. The stated aim of that method was to increase the minimum wire spacing and to reduce the peak temperature in a coil for fixed efficiency. These claims are tested in this study with experimental measurements of magnetic field and temperature as well as simulations of the performance of many coils. Experimental results show a 90% increase in minimum wire spacing and 40% reduction in peak temperature for equal coil efficiency and field linearity. Simulations of many more coils indicate increase in minimum wire spacing of between 50 and 340% for the coils studied here. This method is shown to be able to increase coil efficiency when constrained by minimum wire spacing rather than switching times or total power dissipation. This increase in efficiency could be used to increase gradient strength, duty cycle, or buildability. Magn Reson Med, 2012.
Keyword Gradient Coils
Minimax |j| current density
Wire spacing
Boundary Element Method
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Information Technology and Electrical Engineering Publications
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Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 10 times in Scopus Article | Citations
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