Detunable Wire Metasurface for Applications in Magnetic Resonance Imaging

Slobozhanyuk, AP; Shchelokova, AV; Dobrykh, DA; Seregin, PS; Powell, DA; Shadrivov, IV; Webb, AG; Belov, PA; Lapine, M

Detunable Wire Metasurface for Applications in Magnetic Resonance Imaging

Slobozhanyuk, AP Shchelokova, AV Dobrykh, DA Seregin, PS Powell, DA Shadrivov, IV Webb, AG Belov, PA Lapine, M

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Publisher:: Allerton Press
Publication Type:: Journal Article
Citation:: Bulletin of the Russian Academy of Sciences: Physics, 2022, 86, (Suppl 1), pp. S216-S221
Issue Date:: 2022-12-01

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Field	Value	Language
dc.contributor.author	Slobozhanyuk, AP
dc.contributor.author	Shchelokova, AV
dc.contributor.author	Dobrykh, DA
dc.contributor.author	Seregin, PS
dc.contributor.author	Powell, DA
dc.contributor.author	Shadrivov, IV
dc.contributor.author	Webb, AG
dc.contributor.author	Belov, PA
dc.contributor.author	Lapine, M https://orcid.org/0000-0002-3557-929X
dc.date.accessioned	2023-04-17T23:59:12Z
dc.date.available	2023-04-17T23:59:12Z
dc.date.issued	2022-12-01
dc.identifier.citation	Bulletin of the Russian Academy of Sciences: Physics, 2022, 86, (Suppl 1), pp. S216-S221
dc.identifier.issn	1062-8738
dc.identifier.issn	1934-9432
dc.identifier.uri	http://hdl.handle.net/10453/169866
dc.description.abstract	Abstract: We introduce a detunable wire metasurface that can electromagnetically couple to an external transmit coil to increase local magnetic resonance imaging (MRI) sensitivity while being almost transparent during excitation. The structure is implemented as an array of wires printed on a dielectric substrate inserted into high-permittivity dielectric blocks at both ends. Detuning is achieved by changing the effective electrical dimensions of the metasurface by inserting switchable nonmagnetic crossed diodes into each wire. We experimentally demonstrate that the metasurface is effectively passively switched off during the transmission by a high current flowing within the wires. During the reception, the currents are much lower; hence the metasurface remains switched on, increasing the local signal-to-noise ratio (SNR). Detuning the metasurface guarantees the patient’s safety and allows standard clinical calibration techniques. This nonlinear mechanism expands the functionalities of metasurfaces and is an essential step toward direct integration in MRI systems.
dc.language	en
dc.publisher	Allerton Press
dc.relation.ispartof	Bulletin of the Russian Academy of Sciences: Physics
dc.relation.isbasedon	10.3103/S1062873822701040
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Nuclear & Particles Physics
dc.title	Detunable Wire Metasurface for Applications in Magnetic Resonance Imaging
dc.type	Journal Article
utslib.citation.volume	86
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access	*
dc.date.updated	2023-04-17T23:59:10Z
pubs.issue	Suppl 1
pubs.publication-status	Published
pubs.volume	86
utslib.citation.issue	Suppl 1

Abstract:

Abstract: We introduce a detunable wire metasurface that can electromagnetically couple to an external transmit coil to increase local magnetic resonance imaging (MRI) sensitivity while being almost transparent during excitation. The structure is implemented as an array of wires printed on a dielectric substrate inserted into high-permittivity dielectric blocks at both ends. Detuning is achieved by changing the effective electrical dimensions of the metasurface by inserting switchable nonmagnetic crossed diodes into each wire. We experimentally demonstrate that the metasurface is effectively passively switched off during the transmission by a high current flowing within the wires. During the reception, the currents are much lower; hence the metasurface remains switched on, increasing the local signal-to-noise ratio (SNR). Detuning the metasurface guarantees the patient’s safety and allows standard clinical calibration techniques. This nonlinear mechanism expands the functionalities of metasurfaces and is an essential step toward direct integration in MRI systems.

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http://hdl.handle.net/10453/169866