Abstract #2228

Influence of electrical properties of lead insulation on radio frequency induced heating during MRI

Mikhail Kozlov^1,2 and Gregor Schaefers^1,3

¹MR:comp GmbH, Gelsenkirchen, Germany, ²Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany, ³Magnetic Resonance Institute for Safety, Technology and Research GmbH, Gelsenkirchen, Germany

We evaluated the dependence of RF-induced power deposited at a hot spot (p) on insulating electrical properties for insulated stainless steel wires of 1.5 mm in diameter with insulation thickness of 0.5 mm. Lead transfer functions (TF) were obtained by 3-D electromagnetic simulations. TF and p depended significantly on electrical properties of insulation. Increased insulator conductivity resulted in decreased p. For all insulated wires investigated non-uniform RF excitation resulted in higher power deposition than uniform RF excitation.

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