An equivalent distributed magnetic current based FDTD method for the calculation of e-fields induced by gradient coils in MRI

Liu, F., Crozier, S. and Wei, Q. (2004). An equivalent distributed magnetic current based FDTD method for the calculation of e-fields induced by gradient coils in MRI. In: Z. Liang, Proceedings of the Twenty-Sixth Annual International Conference of the IEEE Engineering in Medicine and Biology Society (IEMBS '04). The Twenty-Sixth Annual International Conference of the IEEE Engineering in Medicine and Biology Society (IEMBS '04), San Francisco, U.S.A., (1124-1127). 1-5 September, 2004. doi:10.1109/IEMBS.2004.1403362


Author Liu, F.
Crozier, S.
Wei, Q.
Title of paper An equivalent distributed magnetic current based FDTD method for the calculation of e-fields induced by gradient coils in MRI
Conference name The Twenty-Sixth Annual International Conference of the IEEE Engineering in Medicine and Biology Society (IEMBS '04)
Conference location San Francisco, U.S.A.
Conference dates 1-5 September, 2004
Proceedings title Proceedings of the Twenty-Sixth Annual International Conference of the IEEE Engineering in Medicine and Biology Society (IEMBS '04)
Journal name Proceedings of the 26th Annual International Conference of the Ieee Engineering in Medicine and Biology Society, Vols 1-7
Place of Publication Piscataway, NJ, U.S.A.
Publisher IEEE Engineering in Medicine and Biology Society
Publication Year 2004
Sub-type Fully published paper
DOI 10.1109/IEMBS.2004.1403362
ISBN 0-7803-8439-3
ISSN 1094-687X
Editor Z. Liang
Volume 1
Start page 1124
End page 1127
Total pages 4
Collection year 2004
Language eng
Abstract/Summary This paper evaluates a low-frequency FDTD method applied to the problem of induced E-fields/eddy currents in the human body resulting from the pulsed magnetic field gradients in MRI. In this algorithm, a distributed equivalent magnetic current (DEMC) is proposed as the electromagnetic source and is obtained by quasistatic calculation of the empty coil's vector potential or measurements therein. This technique circumvents the discretizing of complicated gradient coil geometries into a mesh of Yee cells, and thereby enables any type of gradient coil modeling or other complex low frequency sources. The proposed method has been verified against an example with an analytical solution. Results are presented showing the spatial distribution of gradient-induced electric fields in a multilayered spherical phantom model and a complete body model.
Subjects E1
291599 Biomedical Engineering not elsewhere classified
671402 Medical instrumentation
Q-Index Code E1

 
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Created: Thu, 23 Aug 2007, 19:33:10 EST