A simple analytical expression for the gradient induced potential on active implants during MRI

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buir.contributor.authorAtalar, Ergin
dc.citation.epage2851
dc.citation.issueNumber10
dc.citation.spage2845
dc.citation.volumeNumber59
dc.contributor.authorTurk, E.A.
dc.contributor.authorKopanoglu, E.
dc.contributor.authorGuney, S.
dc.contributor.authorBugdayci, K.E.
dc.contributor.authorIder, Y. Z.
dc.contributor.authorErturk, V. B.
dc.contributor.authorAtalar, Ergin
dc.date.accessioned2016-02-08T09:44:45Z
dc.date.available2016-02-08T09:44:45Z
dc.date.issued2012
dc.departmentDepartment of Electrical and Electronics Engineering
dc.departmentNational Magnetic Resonance Research Center (UMRAM)
dc.description.abstractDuring magnetic resonance imaging, there is an interaction between the time-varying magnetic fields and the active implantable medical devices (AIMD). In this study, 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 AIMD 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.
dc.identifier.doi10.1109/TBME.2012.2212190
dc.identifier.issn0189-294
dc.identifier.urihttp://hdl.handle.net/11693/21323
dc.language.isoEnglish
dc.relation.isversionofhttp://dx.doi.org/10.1109/TBME.2012.2212190
dc.source.titleIEEE Transactions on Biomedical Engineering
dc.subjectActive implantable medical devices (AIMD)
dc.subjectGradient fields
dc.subjectMagnetic resonance imaging (MRI)
dc.subjectStimulation risk
dc.subjectActive implants
dc.subjectAnalytical expressions
dc.subjectClosed form
dc.subjectCylindrical phantoms
dc.subjectGradient coil
dc.subjectGradient fields
dc.subjectImplantable medical devices
dc.subjectSimplified expressions
dc.subjectTime-varying magnetic fields
dc.subjectVolume of interest
dc.subjectElectric fields
dc.subjectMagnetic fields
dc.subjectMagnetic resonance imaging
dc.subjectBiomedical equipment
dc.subjectlead
dc.subjectAnimal tissue
dc.subjectAnura
dc.subjectArticle
dc.subjectElectric field
dc.subjectElectrode
dc.subjectImplant
dc.subjectLeg
dc.subjectMagnetic field
dc.subjectNonhuman
dc.subjectNuclear magnetic resonance imaging
dc.subjectStimulus response
dc.subjectValidity
dc.subjectAnimals
dc.subjectAnura
dc.subjectElectromagnetic fields
dc.subjectExtremities
dc.subjectMagnetic resonance imaging
dc.subjectModels, biological
dc.subjectPhantoms, imaging
dc.subjectProstheses and implants
dc.subjectSignal Processing, computer-assisted
dc.titleA simple analytical expression for the gradient induced potential on active implants during MRI
dc.typeArticle

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