Modal analysis of currents induced by magnetic resonance imaging gradient coils

Sanchez, Hector, Poole, Michael, Trakic, Adnan, Freschi, Fabio, Smith, Elliot, Herbert, Jeremy, Fuentes, Miguel, Li, Yu, Tang, Fangfang, Repetto, Maurizio and Crozier, Stuart (2014) Modal analysis of currents induced by magnetic resonance imaging gradient coils. IEEE Transactions on Magnetics, 50 2: 7023404.1-7023404.4. doi:10.1109/TMAG.2013.2282392


Author Sanchez, Hector
Poole, Michael
Trakic, Adnan
Freschi, Fabio
Smith, Elliot
Herbert, Jeremy
Fuentes, Miguel
Li, Yu
Tang, Fangfang
Repetto, Maurizio
Crozier, Stuart
Title Modal analysis of currents induced by magnetic resonance imaging gradient coils
Journal name IEEE Transactions on Magnetics   Check publisher's open access policy
ISSN 0018-9464
1941-0069
Publication date 2014-02-02
Sub-type Article (original research)
DOI 10.1109/TMAG.2013.2282392
Open Access Status Not Open Access
Volume 50
Issue 2
Start page 7023404.1
End page 7023404.4
Total pages 4
Place of publication Piscataway, NJ, United States
Publisher Institute of Electrical and Electronics Engineers
Language eng
Abstract In magnetic resonance imaging (MRI), gradient coils are switched during fast current pulse sequences. These time-varying fields interact with the conducting structures of the scanner, producing deleterious effects such as image distortions and Joule heating. Using a multi-layer integral method, the spatiotemporal nature of the eddy currents induced by the gradient coils is investigated. The existence of the eigenmode is experimentally demonstrated by measuring the magnetic field and the time decay constant of a typical unshielded z-gradient coil and its interaction with a conductive cylinder. An effective current tailoring is achieved using the characteristic eigenvalues of the conducting domain-exciting coil system. The method can be used to understand and mitigate undesired effects of eddy currents in MRI.
Keyword Eddy currents
Eigenmodes
Eigenvalues
Integral equations
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Information Technology and Electrical Engineering Publications
 
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Created: Thu, 27 Feb 2014, 20:09:54 EST by Dr Hector Sanchez Lopez on behalf of Centre for Medical Diagnostic Technologies in Qld