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Abstract #0179

Impedance measurements detect the temperature rise near DBS

Berk Silemek1, Frank Seifert1, Rüdiger Brühl1, Bernd Ittermann1, and Lukas Winter1
1Physikalisch-Technische Bundesanstalt (PTB) Braunschweig and Berlin, Berlin, Germany

Synopsis

Keywords: Safety, Safety, Deep brain stimulation, Active implantable medical devices, RF Safety, parallel transmission

Motivation: Scanning patients with neurostimulators is a serious safety concern.

Goal(s): To work towards subject- and situation-specific risk assessments for implant carriers by demonstrating that crucial safety information can be read directly from a commercial deep brain stimulator (DBS) device.

Approach: Calibration, phantom and MRI experiments based on impedance measurements of commercial 8-electrode DBS lead are performed.

Results: RF-induced heating alters the tissue electrical conductivity (~2%/℃) around DBS electrodes, which can be measured as an impedance or reciprocal admittance change. The causal relationship is demonstrated at both 3T and 7T. RF-induced heating is suppressed using implant-friendly mode in MRI solely based on impedance measurements

Impact: This work opens the door towards direct temperature measurements near the tip end of active medical implants using the implant itself as a temperature sensor. This could bring a disruptive change in the management of implant safety in MRI.

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