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Monolithic Multi-Scale Modeling of MR-Induced Pacemaker Lead Heating

Oskar Talcoth (Institutionen för signaler och system, Biomedicinsk elektromagnetik) ; Thomas Rylander (Institutionen för signaler och system, Signalbehandling) ; Hoi Shun Lui (Institutionen för signaler och system, Biomedicinsk elektromagnetik) ; Mikael Persson (Institutionen för signaler och system, Biomedicinsk elektromagnetik)
13th International Conference on Electromagnetics in Advanced Applications (ICEAA), 2011, Torino, 12-16 September 2011 p. 599 - 602 . (2011)
[Konferensbidrag, refereegranskat]

Modeling of MR-induced pacemaker lead heating is complicated by, among other things, the multi-scale characteristics of the problem. In this paper, the method of moments is used to model a wide range of length scales of the problem simultaneously including the helix-shaped conducting wires present in the pacemaker lead. A cross-section area conserving meshing scheme for helices is proposed and evaluated. For a relative error of 1%, the meshing scheme reduces the number of thin wire segments needed to model a helix with a factor of roughly 3 to 6, as compared to the conventional approach. In addition, we study the relationship between the maximum induced current on the lead and the number of turns of the helices.

Nyckelord: Coils, Heating, Helix, Implant safety, Lead, Magnetic resonance imaging, MR safety, Pacemakers, Phantoms, Thin-wire approximation, Wires



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Denna post skapades 2011-11-15. Senast ändrad 2011-12-06.
CPL Pubid: 148537

 

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