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Abstract #2225

Power deposition into a metallic hip prosthesis exposed to switched gradient fields

Luca Zilberti1, Oriano Bottauscio1, Mario Chiampi2, Jeffrey Hand3, Hector Sanchez Lopez4, Rüdiger Brühl5, and Stuart Crozier6

1Istituto Nazionale di Ricerca Metrologica, Torino, Italy, 2Dipartimento Energia, Politecnico di Torino, Torino, Italy, 3Division of Imaging Sciences and Biomedical Engineering, King’s College London, London, United Kingdom, 4Department of Engineering, Universitas Dian Nuswantoro, Semarang, Indonesia, 5Physikalisch-Technische Bundesanstalt, Berlin, Germany, 6School of Information Technology and Electrical Engineering, University of Queensland, St. Lucia, Australia

Concern has been recently raised about the possible heating of massive metallic implants, in particular hip prostheses, due to the gradient fields used in MRI. Thus, this contribution discusses the computation of the power density deposited by the magnetic field into the implant, which represents the first step to estimate the thermal heating. The analysis is based on numerical simulations, performed through a computational formulation applied to an anatomical model of the body. The results provide evidence of the role of the three gradient coil axes and of the different harmonic components of the signals in this power deposition process.

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