Data‐Driven Experimental Evaluation Method for the Safety Assessment of Implants With Respect to RF‐Induced Heating During MRI

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...

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Bibliographic Details
Published in:Radio science 2018-06, Vol.53 (6), p.700-709
Main Authors: Yao, Aiping, Zastrow, Earl, Kuster, Niels
Format: Article
Language:English
Subjects:
Computer simulation
Deposition
Electrodes
Evaluation
experimental assessment
implant safety
Instrumentation
magnetic resonance imaging
Radio frequency
RF heating
Surgical implants
Transplants & implants
uncertainty
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Summary: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. Key Points Data‐driven evaluation to reduce experimental uncertainty in near‐field measurements Experimental technique to overcome extreme spatial gradient in implant's RF‐ heating evaluation Review of traditional measurement technique used in implant's RF‐heating evaluation
ISSN:0048-6604
1944-799X
DOI:10.1029/2017RS006433