A z-gradient array for simultaneous multi-slice excitation with a single-band RF pulse

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buir.contributor.authorAtalar, Ergin
buir.contributor.authorErtan, Koray
buir.contributor.authorTaraghinia, Soheil
buir.contributor.authorSadeghi, Alireza
dc.citation.epage412en_US
dc.citation.issueNumber1en_US
dc.citation.spage400en_US
dc.citation.volumeNumber80en_US
dc.contributor.authorErtan, Korayen_US
dc.contributor.authorTaraghinia, Soheilen_US
dc.contributor.authorSadeghi, Alirezaen_US
dc.contributor.authorAtalar, Erginen_US
dc.date.accessioned2019-02-21T16:02:22Z
dc.date.available2019-02-21T16:02:22Z
dc.date.issued2018en_US
dc.departmentNational Magnetic Resonance Research Center (UMRAM)en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractPurpose: Multi-slice radiofrequency (RF) pulses have higher specific absorption rates, more peak RF power, and longer pulse durations than single-slice RF pulses. Gradient field design techniques using a z-gradient array are investigated for exciting multiple slices with a single-band RF pulse. Theory and Methods: Two different field design methods are formulated to solve for the required current values of the gradient array elements for the given slice locations. The method requirements are specified, optimization problems are formulated for the minimum current norm and an analytical solution is provided. A 9-channel z-gradient coil array driven by independent, custom-designed gradient amplifiers is used to validate the theory. Results: Performance measures such as normalized slice thickness error, gradient strength per unit norm current, power dissipation, and maximum amplitude of the magnetic field are provided for various slice locations and numbers of slices. Two and 3 slices are excited by a single-band RF pulse in simulations and phantom experiments. Conclusion: The possibility of multi-slice excitation with a single-band RF pulse using a z-gradient array is validated in simulations and phantom experiments. Magn Reson Med 80:400-412, 2018.
dc.embargo.release2019-03-29en_US
dc.identifier.doi10.1002/mrm.27031
dc.identifier.issn0740-3194
dc.identifier.urihttp://hdl.handle.net/11693/49995
dc.language.isoEnglish
dc.publisherJohn Wiley and Sons
dc.relation.isversionofhttps://doi.org/10.1002/mrm.27031
dc.source.titleMagnetic Resonance in Medicineen_US
dc.subjectGradient arrayen_US
dc.subjectMulti-slice excitationen_US
dc.subjectRF pulse designen_US
dc.subjectSimultaneous multi-slice (SMS)en_US
dc.titleA z-gradient array for simultaneous multi-slice excitation with a single-band RF pulseen_US
dc.typeArticleen_US

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National Magnetic Resonance Research Center (UMRAM)
Department of Electrical and Electronics Engineering