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Abstract #4185

Avoiding Systematic Errors of Fiber-optic Temperature Probes: MR Thermometry for Safety Assessment of Small Planar Metallic Structures

Thomas Lottner1, Johannes B. Erhardt2,3, Andreas Reichert1, Ali Caglar Özen1,4, Lars Bielak1, Martin Schuettler5, and Michael Bock1

1Department of Radiology, Medical Physics, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany, 2Department of Microsystems Engineering - IMTEK, University of Freiburg, Freiburg, Germany, 3BrainLinks-BrainTools, Freiburg, Germany, 4German Cancer Consortium Partner Site Freiburg, German Cancer Research Center (DKFZ), Heidelberg, Germany, 5CorTec GmbH, Freiburg, Germany

Patients with AMIDs are exposed to a significant safety hazard during MRI, as the RF excitation couples to the elongated metallic structures of the AIMD resulting in an unwanted heating of tissue. Temperature measurements are the standard method for heating tests of implants to ensure patient safety during MRI exams. Temperature sensors with a significant size compared to the samples influence the RF absorption of energy and can distort the temperature distribution. MR thermometry can provide a non-invasive 2D alternative.

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