This work intends to provide a preliminary evaluation of the uncertainty produced by current Tier 3 approach during the assessment of subcutaneous and partially implanted devices. The transfer function of a 600 mm long DBS and guidance wire for Interventional MRI are derived under homogeneous and heterogeneous tissue environments, respectively. The resulting power deposition using different transfer function are evaluated and compared. The results show that using current Tier 3 approach may lead to potential large underestimation of the power deposition for subcutaneous and partially implanted devices, methods which can overcome or reduce these uncertainty are needed.
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