Numerical methods and software tools for simulation, design, and resonant mode analysis of radio frequency birdcage coils used in MRI

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dc.citation.epage32en_US
dc.citation.issueNumber1en_US
dc.citation.spage13en_US
dc.citation.volumeNumber45en_US
dc.contributor.authorGurler, N.en_US
dc.contributor.authorIder, Y. Z.en_US
dc.date.accessioned2016-02-08T10:17:01Z
dc.date.available2016-02-08T10:17:01Z
dc.date.issued2015en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractDesign of magnetic resonance imaging (MRI) radiofrequency (RF) coils using lumped circuit modeling based techniques begins to fail at high frequencies, and therefore more accurate models based on the electromagnetic field calculations must be used. Field calculations are also necessary to understand the interactions between the RF field and the subject inside the coil. Furthermore, observing the resonance behavior of the coil and the fields at the resonance frequencies have importance for design and analysis. In this study, finite element method (FEM) based methods have been proposed for accurate time-harmonic electromagnetic simulations, estimation of the tuning capacitors on the rungs or end rings, and the resonant mode analysis of the birdcage coils. Capacitance estimation was achieved by maximizing the magnitude of the port impedance at the desired frequency while simultaneously minimizing the variance of RF magnetic field in the region of interest. In order for the proposed methods to be conveniently applicable, two software tools, resonant mode and frequency domain analyzer (RM-FDA) and Optimum Capacitance Finder (OptiCF), were developed. Simulation results for the validation and verification of the software tools are provided for different cases including human head simulations. Additionally, two handmade birdcage coils (low-pass and high-pass) were built and resonance mode measurements were made. Results of the software tools are compared with the measurement results as well as with the results of the lumped circuit modeling based method. It has been shown that the proposed software tools can be used for accurate simulation and design of birdcage coils. © 2015 Wiley Periodicals, Inc.en_US
dc.identifier.doi10.1002/cmr.b.21279en_US
dc.identifier.issn1552-5031
dc.identifier.urihttp://hdl.handle.net/11693/23658
dc.language.isoEnglishen_US
dc.publisherWiley-Liss Inc.en_US
dc.relation.isversionofhttp://dx.doi.org/10.1002/cmr.b.21279en_US
dc.source.titleConcepts in Magnetic Resonance Part B: Magnetic Resonance Engineeringen_US
dc.subjectCoil designen_US
dc.subjectElectromagnetic simulationen_US
dc.subjectFinite element methoden_US
dc.subjectHigh-field MRIen_US
dc.subjectResonant mode analysisen_US
dc.subjectRF birdcage coilen_US
dc.subjectSoftware toolen_US
dc.titleNumerical methods and software tools for simulation, design, and resonant mode analysis of radio frequency birdcage coils used in MRIen_US
dc.typeArticleen_US
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