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Abstract #4185

Heating risk by radiofrequency and switching gradient fields in the presence of metallic implants

Valeria Clementi1, Umberto Zanovello2, Alessandro Arduino2, Cristina Ancarani1, Barbara Bordini1, Oriano Bottauscio2, Mario Chiampi2, Luca Zilberti2, and Fabio Baruffaldi1
1Medical Technology Laboratory, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy, 2Istituto Nazionale di Ricerca Metrologica (INRIM), Torino, Italy

A growing number of patients with metallic implants are subjected to MRI exams, but a patient-specific heating risk assessment is not easily available. After a frequency analysis of databases collecting prosthetic patients data, a heating risk assessment, based on existing standards for RF fields and recent scientific studies for switching gradient coil fields, is performed. Results show that the whole body SAR estimation provided by the MRI scanner is not a self-reliant safety index for patients with metallic implants and suggest the need for a general procedure involving both RF and gradient coil fields induced heating.

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