Viscoelastic modulus of agarose gels by magnetic resonance elastography using Micro-MRI

This study aimed to apply magnetic resonance elastography (MRE) using micro-magnetic resonance imaging (micro-MRI) system for the measurements of viscoelastic modulus in soft matters. The rectangular specimens of 90 × 70 × 50 mm were made of agarose gel with five kinds of stiffness by changing conce...

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Autores principales:	Hayato SUZUKI, Shigeru TADANO, Mototeru GOTO, Satoshi YAMADA, Kazuhiro FUJISAKI, Itsuro KAJIWARA, Mikio SUGA, Gen NAKAMURA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2015
Materias:	magnetic resonance elastography magnetic resonance imaging viscoelasticity soft matter stiffness elastic modulus Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/d37449c5947046ae978e5dd975c717e1
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spelling	oai:doaj.org-article:d37449c5947046ae978e5dd975c717e12021-11-26T06:25:42ZViscoelastic modulus of agarose gels by magnetic resonance elastography using Micro-MRI2187-974510.1299/mej.14-00417https://doaj.org/article/d37449c5947046ae978e5dd975c717e12015-04-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/2/3/2_14-00417/_pdf/-char/enhttps://doaj.org/toc/2187-9745This study aimed to apply magnetic resonance elastography (MRE) using micro-magnetic resonance imaging (micro-MRI) system for the measurements of viscoelastic modulus in soft matters. The rectangular specimens of 90 × 70 × 50 mm were made of agarose gel with five kinds of stiffness by changing concentrations. The specimens were oscillated with longitudinal waves transmitted by an elastic-bar from a vibration generator in a micro-MRI system. Since the viscoelastic properties depend on the excitation frequency and amplitude, the experimental conditions were selected in the range of 50-250 Hz and 0.1-0.5 mm. The viscoelastic modulus was expressed as storage shear modulus G´ and loss shear modulus G˝. As a result, G´ increased with the frequency and amplitude, and the difference of G´ between hard and soft gels was obtained. The viscoelastic modulus of agarose gels was measured using the MRE system under the excitation conditions. Furthermore, double-layer specimens composed of 0.6 and 2.0 wt% gels were examined as an application of the MRE system. The difference of wave pattern between the hard and soft parts was observed. The values of G´ in the soft parts of the double-layer specimens corresponded to the value of the single-layer specimen, but the values of G´ in the hard parts were varied.Hayato SUZUKIShigeru TADANOMototeru GOTOSatoshi YAMADAKazuhiro FUJISAKIItsuro KAJIWARAMikio SUGAGen NAKAMURAThe Japan Society of Mechanical Engineersarticlemagnetic resonance elastographymagnetic resonance imagingviscoelasticitysoft matter stiffnesselastic modulusMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 2, Iss 3, Pp 14-00417-14-00417 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	magnetic resonance elastography magnetic resonance imaging viscoelasticity soft matter stiffness elastic modulus Mechanical engineering and machinery TJ1-1570
spellingShingle	magnetic resonance elastography magnetic resonance imaging viscoelasticity soft matter stiffness elastic modulus Mechanical engineering and machinery TJ1-1570 Hayato SUZUKI Shigeru TADANO Mototeru GOTO Satoshi YAMADA Kazuhiro FUJISAKI Itsuro KAJIWARA Mikio SUGA Gen NAKAMURA Viscoelastic modulus of agarose gels by magnetic resonance elastography using Micro-MRI
description	This study aimed to apply magnetic resonance elastography (MRE) using micro-magnetic resonance imaging (micro-MRI) system for the measurements of viscoelastic modulus in soft matters. The rectangular specimens of 90 × 70 × 50 mm were made of agarose gel with five kinds of stiffness by changing concentrations. The specimens were oscillated with longitudinal waves transmitted by an elastic-bar from a vibration generator in a micro-MRI system. Since the viscoelastic properties depend on the excitation frequency and amplitude, the experimental conditions were selected in the range of 50-250 Hz and 0.1-0.5 mm. The viscoelastic modulus was expressed as storage shear modulus G´ and loss shear modulus G˝. As a result, G´ increased with the frequency and amplitude, and the difference of G´ between hard and soft gels was obtained. The viscoelastic modulus of agarose gels was measured using the MRE system under the excitation conditions. Furthermore, double-layer specimens composed of 0.6 and 2.0 wt% gels were examined as an application of the MRE system. The difference of wave pattern between the hard and soft parts was observed. The values of G´ in the soft parts of the double-layer specimens corresponded to the value of the single-layer specimen, but the values of G´ in the hard parts were varied.
format	article
author	Hayato SUZUKI Shigeru TADANO Mototeru GOTO Satoshi YAMADA Kazuhiro FUJISAKI Itsuro KAJIWARA Mikio SUGA Gen NAKAMURA
author_facet	Hayato SUZUKI Shigeru TADANO Mototeru GOTO Satoshi YAMADA Kazuhiro FUJISAKI Itsuro KAJIWARA Mikio SUGA Gen NAKAMURA
author_sort	Hayato SUZUKI
title	Viscoelastic modulus of agarose gels by magnetic resonance elastography using Micro-MRI
title_short	Viscoelastic modulus of agarose gels by magnetic resonance elastography using Micro-MRI
title_full	Viscoelastic modulus of agarose gels by magnetic resonance elastography using Micro-MRI
title_fullStr	Viscoelastic modulus of agarose gels by magnetic resonance elastography using Micro-MRI
title_full_unstemmed	Viscoelastic modulus of agarose gels by magnetic resonance elastography using Micro-MRI
title_sort	viscoelastic modulus of agarose gels by magnetic resonance elastography using micro-mri
publisher	The Japan Society of Mechanical Engineers
publishDate	2015
url	https://doaj.org/article/d37449c5947046ae978e5dd975c717e1
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Viscoelastic modulus of agarose gels by magnetic resonance elastography using Micro-MRI

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