Development of an Absorbing Radio Frequency Shield for Safe Magnetic Resonance Imaging

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dc.contributor.advisorChen, Ji
dc.contributor.committeeMemberJackson, David R.
dc.contributor.committeeMemberChen, Jiefu
dc.contributor.committeeMemberBenhaddou, Driss
dc.contributor.committeeMemberZouridakis, George
dc.creatorLi, Lintong
dc.date.accessioned2018-03-12T18:47:41Z
dc.date.available2018-03-12T18:47:41Z
dc.date.createdDecember 2017
dc.date.issued2017-12
dc.date.submittedDecember 2017
dc.date.updated2018-03-12T18:47:41Z
dc.description.abstractIn this dissertation, we propose a design for an absorbing radio frequency shield (ARFS) that helps to reduce the RF-induced heating effects at the tip of a deep brain stimulation (DBS) lead. We first review the transfer function method used to evaluate RF-induced temperature rise at a DBS lead tip, including both theory and measurements. Next, an ARFS shell is designed for a generic head-trunk human model for basic electromagnetic full-wave and thermal validations. A multi-layered ARFS shell structure is proposed, which consists of a highly conducting layer (HCL) embedded in a thick absorbing conductive layer (ACL) and an insulating layer. Furthermore, a similar ARFS shell is applied to an anatomically-correct human model with implanted DBS leads. The temperature rise at the lead tip is calculated and the shielding effectiveness of the proposed ARFS is analyzed. A total number of 297 lead-pathways are investigated. A head-only ARFS is also discussed for higher flexibility. Finally, the lead-tip temperature rise is measured inside a phantom for seven typical lead trajectories, in order to validate the methodology and the effectiveness of the proposed ARFS. The proposed ARFS structure is demonstrated to effectively reduce the temperature rise at the DBS lead tip for the trajectories studied in this dissertation. The average percentage reduction is 49.0% from the experimental results and 55.6% from the corresponding simulation results.
dc.description.departmentElectrical and Computer Engineering, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/10657/2877
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectARFS
dc.subjectRF-induced heating
dc.subjectTransfer function method
dc.subjectDBS lead
dc.titleDevelopment of an Absorbing Radio Frequency Shield for Safe Magnetic Resonance Imaging
dc.type.dcmiText
dc.type.genreThesis
local.embargo.lift2018-12-01
local.embargo.terms2018-12-01
thesis.degree.collegeCullen College of Engineering
thesis.degree.departmentElectrical and Computer Engineering, Department of
thesis.degree.disciplineElectrical Engineering
thesis.degree.grantorUniversity of Houston
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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