A novel verse optimal RF pulse design method for parallel transmission in magnetic resonance imaging

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buir.advisorAtalar, Ergin
dc.contributor.authorBayındır, Haldun Özgür
dc.date.accessioned2016-01-08T18:18:03Z
dc.date.available2016-01-08T18:18:03Z
dc.date.issued2009
dc.descriptionAnkara : The Department of Electrical and Electronics Engineering and the Institute of Engineering and Science of Bilkent University, 2009.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 2009.en_US
dc.descriptionIncludes bibliographical references leaves 39-41.en_US
dc.description.abstractA novel radio frequency (RF) pulse design method for magnetic resonance imaging (MRI) and an improvement to an existing method that reduces specific absorption rate (SAR) in MRI are presented. The new RF pulse design method, variable rate selective excitation optimal RF pulse design method for parallel transmission (VERSEp), is developed for parallel transmission and aim of the method is to design RF pulses with lowest SAR after SAR reduction with variable rate selective excitation (VERSE) method. This is achieved by modifying the SAR optimal RF pulse deisgn method for parallel transmission. Performance of the VERSEp method is tested by comparing VERSE-SAR reduced SAR of the RF pulses designed with SAR optimal RF pulse design method and VERSE-SAR reduced SAR of the RF pulses designed using VERSEp. In the simulations, SAR reductions up to 47% are obtained. Different aspects of VERSEp are also shown with simulations. The second contribution of this work is an improvement made to an existing constrained VERSE-SAR reduction method. The existing VERSE-SAR reduction method uses a peak RF constaint for SAR reduction. In this work, peak square root power constraint is used instead of peak RF constraint in the VERSE-SAR reduction method. In the simulation results, the SAR of the RF pulses designed using the improved method were compared with SAR of the RF pulses designed using the method before improvement. SAR reductions up to 50% are obtained by using peak square root power constrained SAR reduction instead of peak RF constrained SAR reduction.en_US
dc.description.provenanceMade available in DSpace on 2016-01-08T18:18:03Z (GMT). No. of bitstreams: 1 0006146.pdf: 2264873 bytes, checksum: 7abf32ff27001994c4568c9516e826bb (MD5)en
dc.description.statementofresponsibilityBayındır, Haldun Özgüren_US
dc.format.extentxi, 41 leaves, illustrations, graphicsen_US
dc.identifier.urihttp://hdl.handle.net/11693/15404
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectSAR reductionen_US
dc.subjectRF poweren_US
dc.subjectParallel Transmissionen_US
dc.subjectTransmit SENSEen_US
dc.subjectVERSEen_US
dc.subject.lccWN185 .B39 2009en_US
dc.subject.lcshMagnetic resonance imaging--Methods.en_US
dc.titleA novel verse optimal RF pulse design method for parallel transmission in magnetic resonance imagingen_US
dc.typeThesisen_US
thesis.degree.disciplineElectrical and Electronic Engineering
thesis.degree.grantorBilkent University
thesis.degree.levelMaster's
thesis.degree.nameMS (Master of Science)

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