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Abstract #2646

Comparison of Pacemaker Lead Tip Heating at 1.5 T and 3T

Jessica A Martinez M1,2, Volkan Acikel2, Patrick Magrath1,2, and Daniel B. Ennis1,2

1Department of Bioengineering, University of California, Los Angeles, CA, United States, 2Department of Radiological Sciences, University of California, Los Angeles, CA, United States

Imaging patients with pacemakers at magnetic fields higher than 1.5T is widely contraindicated due to safety concerns. Since SAR increases with B₀² it is expected that lead tip heating (LTH) may increase substantially. Recent studies, however, provide evidence that contradicts this belief. Electromagnetic damping can occur in highly conductive materials at high field strengths and may result in lower LTH. Our objective was to compare LTH at 1.5T and 3T for five pacemakers with realistic implant configuration in the ASTM torso phantom. The results obtained showed that heating at 3T was not greater than 1.5T, which supports the argument that electromagnetic damping can result in lower LTH at higher field strengths.

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