Keywords: Safety, Safety
Motivation: To reduce radiofrequency (RF)-induced heating of abandoned implantable cardiac leads equipped with plastic caps, which remarkably increase heat generation around the lead tip.
Goal(s): RF-induced heating with various electrical property of the cap was investigated to find optimal condition.
Approach: Tissue heating around the lead wire with caps of electrical conductivity ranging over 10-6 to 10+6 S/m were compared in the ASTM phantom model by FDTD simulation, and validated by experiments.
Results: Tissue heating around the lead tip clearly decreased and became similar to the uncapped case, when the conductivity was higher than 10-1 S/m, which was approximately the same as the media.
Impact: Simulations and experiments on abandoned cardiac leads revealed that the "electrically conductive cap" dramatically reduces RF-induced heating around the lead tip. Such cap may protect the lead from body fluid infiltration into the insulation material while also contribute to MR-safety.
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