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Experimental investigation of a metasurface resonator for in vivo imaging at 1.5 T

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dc.contributor.authorShchelokova, Alena V
dc.contributor.authorSlobozhanyuk, Alexey P
dc.contributor.authorde Bruin, Paul
dc.contributor.authorZivkovic, Irena
dc.contributor.authorKallos, Efthymios
dc.contributor.authorBelov, Pavel A
dc.contributor.authorWebb, Andrew
dc.date.accessioned2018-01-19T03:07:40Z
dc.date.available2018-01-19T03:07:40Z
dc.date.issued2018-01
dc.description.abstractIn this work, we experimentally demonstrate an increase in the local transmit efficiency of a 1.5 T MRI scanner by using a metasurface formed by an array of brass wires embedded in a high permittivity low loss medium. Placement of such a structure inside the scanner results in strong coupling of the radiofrequency field produced by the body coil with the lowest frequency electromagnetic eigenmode of the metasurface. This leads to spatial redistribution of the near fields with enhancement of the local magnetic field and an increase in the transmit efficiency per square root maximum specific absorption rate in the region-of-interest. We have investigated this structure in vivo and achieved a factor of 3.3 enhancement in the local radiofrequency transmit efficiency.en_AU
dc.description.sponsorshipThe numerical calculations were supported by the Russian Science Foundation (Project No. 15-19-20054). Experimental studies were supported by the Ministry of Education and Science of the Russian Federation (Zadanie No. 3.2465.2017/4.6) and partially by the European Research Council Advanced Grant number 670629 (A.W.) and Medical Wireless Sensing Ltd.en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn1090-7807en_AU
dc.identifier.urihttp://hdl.handle.net/1885/139483
dc.publisherElsevieren_AU
dc.rights© 2017 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).en_AU
dc.sourceJournal of Magnetic Resonanceen_AU
dc.subjectimplanten_AU
dc.subjectmetasurfaceen_AU
dc.subjectspecific absorption rateen_AU
dc.subjecttransmit efficiencyen_AU
dc.titleExperimental investigation of a metasurface resonator for in vivo imaging at 1.5 Ten_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Accessen_AU
local.bibliographicCitation.lastpage81en_AU
local.bibliographicCitation.startpage78en_AU
local.contributor.affiliationSlobozhanyuk, A. P., Nonlinear Physics Center, The Australian National Universityen_AU
local.contributor.authoruidu5536507en_AU
local.identifier.ariespublicationu4485658xPUB2520
local.identifier.citationvolume286en_AU
local.identifier.doi10.1016/j.jmr.2017.11.013en_AU
local.identifier.essn1096-0856en_AU
local.publisher.urlhttps://www.elsevier.com/en_AU
local.type.statusPublished Versionen_AU

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