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231225s2022 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202109032
|2 doi
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|a pubmed24n1509.xml
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|a eng
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| 100 |
1 |
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|a Wu, Ke
|e verfasserin
|4 aut
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|a Auxetics-Inspired Tunable Metamaterials for Magnetic Resonance Imaging
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|c 2022
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|a Text
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|a ƒaComputermedien
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|a Date Completed 11.02.2022
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|a Date Revised 22.08.2024
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2021 Wiley-VCH GmbH.
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|a Auxetics refers to structures or materials with a negative Poisson's ratio, thereby capable of exhibiting counterintuitive behaviors. Herein, auxetic structures are exploited to design mechanically tunable metamaterials in both planar and hemispherical configurations operating at megahertz (MHz) frequencies, optimized for their application to magnetic resonance imaging (MRI). Specially, the reported tunable metamaterials are composed of arrays of interjointed unit cells featuring metallic helices, enabling auxetic patterns with a negative Poisson's ratio. The deployable deformation of the metamaterials yields an added degree of freedom with respect to frequency tunability through the resultant modification of the electromagnetic interactions between unit cells. The metamaterials are fabricated using 3D printing technology and an ≈20 MHz frequency shift of the resonance mode is enabled during deformation. Experimental validation is performed in a clinical (3.0 T) MRI system, demonstrating that the metamaterials enable a marked boost in radiofrequency field strength under resonance-matched conditions, ultimately yielding a dramatic increase in the signal-to-noise ratio (≈4.5×) of MRI. The tunable metamaterials presented herein offer a novel pathway toward the practical utilization of metamaterials in MRI, as well as a range of other emerging applications
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|a Journal Article
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|a auxetics
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|a magnetic coupling
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|a magnetic resonance imaging
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|a signal-to-noise ratio
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|a tunable metamaterials
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|a Zhao, Xiaoguang
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bifano, Thomas G
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Anderson, Stephan W
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhang, Xin
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 34(2022), 6 vom: 01. Feb., Seite e2109032
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|x 1521-4095
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|g volume:34
|g year:2022
|g number:6
|g day:01
|g month:02
|g pages:e2109032
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|u http://dx.doi.org/10.1002/adma.202109032
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