Calculating current densities and fields produced by shielded magnetic resonance imaging probes

Forbes, Lawrence K., Crozier, Stuart and Doddrell, David M. (1997) Calculating current densities and fields produced by shielded magnetic resonance imaging probes. Siam Journal On Applied Mathematics, 57 2: 401-425. doi:10.1137/S0036139995283110

Attached Files (Some files may be inaccessible until you login with your UQ eSpace credentials)
Name Description MIMEType Size Downloads
UQ57565_OA.pdf Full text (open access) application/pdf 873.67KB 0

Author Forbes, Lawrence K.
Crozier, Stuart
Doddrell, David M.
Title Calculating current densities and fields produced by shielded magnetic resonance imaging probes
Journal name Siam Journal On Applied Mathematics   Check publisher's open access policy
ISSN 0036-1399
1095-712X
Publication date 1997
Sub-type Article (original research)
DOI 10.1137/S0036139995283110
Open Access Status File (Publisher version)
Volume 57
Issue 2
Start page 401
End page 425
Total pages 25
Place of publication Philadelphia, PA, United States
Publisher Society for Industrial and Applied Mathematics
Language eng
Abstract A method is presented for computing the fields produced by radio frequency probes of the type used in magnetic resonance imaging. The effects of surrounding the probe with a shielding coil, intended to eliminate stray fields produced outside the probe, are included. An essential feature of these devices is the fact that the conducting rungs of the probe are of finite width relative to the coil radius, and it is therefore necessary to find the distribution of current within the conductors as part of the solution process. This is done here using a numerical method based on the inverse finite Hilbert transform, applied iteratively to the entire structure including its shielding coils. It is observed that the fields are influenced substantially by the width of the conducting rungs of the probe, since induced eddy currents within the rungs become more pronounced as their width is increased. The shield is also shown to have a significant effect on both the primary current density and the resultant fields. Quality factors are computed for these probes and compared with values measured experimentally.
Keyword Mathematics, Applied
Radio-frequency Probe
Quality Factor
Integral Equations
Inverse Finite Hilbert Transform
Efficient
Coils
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Information Technology and Electrical Engineering Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 29 times in Thomson Reuters Web of Science Article | Citations
Google Scholar Search Google Scholar
Created: Mon, 13 Aug 2007, 16:45:35 EST