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Data‐Driven Experimental Evaluation Method for the Safety Assessment of Implants With Respect to RF‐Induced Heating During MRI
Author(s) -
Yao Aiping,
Zastrow Earl,
Kuster Niels
Publication year - 2018
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2017rs006433
Subject(s) - deposition (geology) , electrode , instrumentation (computer programming) , radio frequency , materials science , biomedical engineering , power (physics) , computer science , acoustics , physics , telecommunications , medicine , paleontology , quantum mechanics , sediment , biology , operating system
Small (mm size) distal electrodes of active medical implants can cause localized radio frequency (RF)‐induced power deposition with extreme spatial gradient (5–6 dB/mm). We propose a method that aims to improve the accuracy of the traditional experimental evaluation, which relies solely on hardware instrumentation. A numerically derived local deposition distribution is used to assist the estimation of power deposition. The method was successfully validated against numerical simulations, considering three different generic implants with a single electrode. The power deposition in the surrounding region of the implant electrodes estimated with the proposed method was validated with less than 1 dB (30%) of uncertainty.