Abstract #0548

Ultra-fast MRI based transfer function determination for the assessment of implant safety.

Janot Tokaya¹, A.J.E. Raaijmakers¹, J.F. Bakker², P.R. Luijten¹, and C.A.T. van den Berg¹

¹Imaging Division, UMC Utrecht, Utrecht, Netherlands, ²Medtronic, Eindhoven, Netherlands

Tissue heating induced by sharply peaked scattered electric fields at the tip of elongated implants is a severe safety hazard refraining patients with active implants from undergoing MRI examinations. Transfer functions (TFs) are widely used in modern safety standards to assess implant safety. Currently, dedicated setups are required to determine TFs in challenging and time consuming experiments. We introduce a new experimental technique based on the principle of reciprocity and exploiting the ability to map induced currents with MRI. The proposed method can accurately determine TFs with high spatial resolution in a single, quick and relatively simple measurement. It furthermore has the potential to be applied in heterogeneous media allowing safety assessment in more realistic scenarios where the conventional methods become inapplicable.

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