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Abstract #0361

Combined heating of hip joint implant by radiofrequency and switched-gradient fields during MRI examination

Alessandro Arduino1, Umberto Zanovello1, Jeff Hand2, Luca Zilberti1, Rüdiger Brühl3, Mario Chiampi1, and Oriano Bottauscio1
1Istituto Nazionale di Ricerca Metrologica, Torino, Italy, 2School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom, 3Physikalisch-Technische Bundesanstalt, Braunschweig and Berlin, Germany

Local heating effects in patients carrying orthopaedic implants have been studied mostly as a consequence of radiofrequency fields and, to a less extent, to gradient coil fields, separately. In this study the heating produced by the combined effects of both fields during realistic clinical sequences is numerically simulated in an anatomical human model carrying a CoCrMo hip implant. Risky situations have been identified, also showing that, sometimes, the gradient field heating can be most significant. The analysis suggests that criteria, based on whole-body SAR only, may not be sufficient to ensure patients’ safety.

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