Influence of electrical properties of lead insulation on radio frequency induced heating during MRI
Mikhail Kozlov1,2 and Gregor Schaefers1,3
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
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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