Wireless deep-subwavelength metamaterial enabling sub-mm resolution magnetic resonance imaging

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buir.contributor.authorGökyar, Sayım
buir.contributor.authorAlipour, Akbar
buir.contributor.authorÜnal, Emre
buir.contributor.authorAtalar, Ergin
buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage219en_US
dc.citation.spage211en_US
dc.citation.volumeNumber274en_US
dc.contributor.authorGökyar, Sayımen_US
dc.contributor.authorAlipour, Akbaren_US
dc.contributor.authorÜnal, Emreen_US
dc.contributor.authorAtalar, Erginen_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2019-02-21T16:01:59Z
dc.date.available2019-02-21T16:01:59Z
dc.date.issued2018en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentNational Magnetic Resonance Research Center (UMRAM)en_US
dc.description.abstractA wireless deep-subwavelength metamaterial architecture is proposed, modeled and demonstrated for a high-resolution magnetic resonance imaging (HR-MRI) application that is miniaturized to be resonant at approximately λ0/1500 dimensions. The proposed structure has the adjustable resonance frequency from 65 MHz to 5.5 GHz for the sub-cm footprint area (8 mm × 8 mm for this study) and provides a quality factor (Q-factor) of approximately 80 in free space for 123 MHz of operation. This structure consists of a cross-via metallized partial-double-layer metamaterial, sandwiching a dielectric thin film; this structure strongly localizes the electric field in this film and has a highly capacitive metal overlay that allows for a wide range of frequency adjustment. Although the achieved resonance frequencies enable a large number of applications, as a proof-of-concept demonstration, we experimentally showed the operation of this wireless metastructure in HR-MRI to highlight its precise frequency adjustment and signal-to-noise-ratio (SNR) improvement capabilities. The proposed metamaterial was found to maintains high Q-factors despite loading with a body-mimicking lossy phantom. The experimental results indicated that the proposed metastructure can be used as an SNR-enhancing device offering 15-fold SNR enhancements that allows for imaging of objects as small as 200 μm in diameter in its vicinity, at an unprecedented level of resolution at the given DC field using standard head coils. As a result of its deep-subwavelength miniaturization accompanied by reasonable Q-factor with outstanding resonance frequency adjustment capability, this class of metastructure is proved to be an excellent candidate for in vivo medical applications.
dc.description.provenanceMade available in DSpace on 2019-02-21T16:01:59Z (GMT). No. of bitstreams: 1 Bilkent-research-paper.pdf: 222869 bytes, checksum: 842af2b9bd649e7f548593affdbafbb3 (MD5) Previous issue date: 2018en
dc.description.sponsorshipHVD gratefully acknowledges support from TÜBA . This work is partially supported by Turkish National Scientific and Technological Research Institute TÜBİTAK-BİDEB . Authors of this work gratefully acknowledge the support of UNAM-National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology.
dc.embargo.release2020-05-01en_US
dc.identifier.doi10.1016/j.sna.2018.03.024
dc.identifier.issn0924-4247
dc.identifier.urihttp://hdl.handle.net/11693/49948
dc.language.isoEnglish
dc.publisherElsevier
dc.relation.isversionofhttps://doi.org/10.1016/j.sna.2018.03.024
dc.relation.projectTürkiye Bilimler Akademisi, TÜBA
dc.source.titleSensors and Actuators, A: Physicalen_US
dc.subjectDeep-subwavelength resonatorsen_US
dc.subjectMagnetic resonance imagingen_US
dc.subjectMetamaterialsen_US
dc.titleWireless deep-subwavelength metamaterial enabling sub-mm resolution magnetic resonance imagingen_US
dc.typeArticleen_US

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