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
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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