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A Simple Analytical Expression for the Gradient Induced Potential on Active Implants During MRI.
MedLine Citation:
PMID:  22893367     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
During MRI, there is an interaction between the time-varying magnetic fields and the active implantable medical devices. In this work, in order to express the nature of this interaction, simplified analytical expressions for the electric fields induced by time-varying magnetic fields are derived inside a homogeneous cylindrical volume. With these analytical expressions, the gradient induced potential on the electrodes of the active implantable medical devices can be approximately calculated if the position of the lead inside the body is known. By utilizing the fact that gradient coils produce linear magnetic field in a volume of interest, the simplified closed form electric field expressions are defined. Using these simplified expressions, the induced potential on an implant electrode has been computed approximately for various lead positions on a cylindrical phantom and verified by comparing with the measured potentials for these sample conditions. In addition, the validity of the method was tested with isolated frog leg stimulation experiments. As a result, these simplified expressions may help in assessing the gradient induced stimulation risk to the patients with implants.
Authors:
E Abaci Turk; E Kopanoglu; S Guney; K Bugdayci; Y Ider; V Erturk; E Atalar
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-07
Journal Detail:
Title:  IEEE transactions on bio-medical engineering     Volume:  -     ISSN:  1558-2531     ISO Abbreviation:  IEEE Trans Biomed Eng     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0012737     Medline TA:  IEEE Trans Biomed Eng     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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