Characterization of material properties of soft solid thin layers with acoustic radiation force and wave propagation

Urban, Matthew W.; Nenadic, Ivan; Qiang, Boqin; Bernal, Miguel; Chen, Shigao D

doi:10.1121/1.4932170

Cited by 10 publications

(10 citation statements)

References 31 publications

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“…Similar to DEHS, various external and internal stimuli may be used to generate transient shear waves within soft tissues. In recent years, DETS, in which the ARF is used to generate a transient shear wave, has attracted considerable attention [4,7,18,20,95,96,99,100]. This method, which generates remotely transient shear waves within biological tissues, permits us to probe the mechanical properties of biological tissues and is relatively suitable for clinical use.…”

Section: Ultrasound-based Elastography Methodsmentioning

confidence: 99%

“…However, when dynamic elastography methods are used to characterize thin-walled soft tissues, the waves are guided, and, therefore, the guided wave theory should be used to interpret the experimental data [100,117–122]. Guided wave elastography (GWE) methods have attracted increasing interest in recent years, although they have not been commercialized yet.…”

Section: Ultrasound-based Elastography Methodsmentioning

confidence: 99%

“…The dispersion relation is generally sensitive to the BCs, geometrical parameters and pre-stresses in the soft tissues [100,117–119,127,128], which should be addressed during the development of a robust inverse method.…”

Section: Ultrasound-based Elastography Methodsmentioning

confidence: 99%

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Mechanics of ultrasound elastography

Li¹,

Cao²

2017

Proc. R. Soc. A.

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Ultrasound elastography enables in vivo measurement of the mechanical properties of living soft tissues in a non-destructive and non-invasive manner and has attracted considerable interest for clinical use in recent years. Continuum mechanics plays an essential role in understanding and improving ultrasound-based elastography methods and is the main focus of this review. In particular, the mechanics theories involved in both static and dynamic elastography methods are surveyed. They may help understand the challenges in and opportunities for the practical applications of various ultrasound elastography methods to characterize the linear elastic, viscoelastic, anisotropic elastic and hyperelastic properties of both bulk and thin-walled soft materials, especially the in vivo characterization of biological soft tissues.

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Section: Ultrasound-based Elastography Methodsmentioning

confidence: 99%

Section: Ultrasound-based Elastography Methodsmentioning

confidence: 99%

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Mechanics of ultrasound elastography

Li¹,

Cao²

2017

Proc. R. Soc. A.

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“…Obviously, the velocity ( , , ) U x y t is a function of both time and space. Figure 1 shows the theoretical dispersion curves obtained by a commercial software package called Disperse (version 2.0.20a, Imperial College London, London, UK) [28]. In this paper, the incidence angle is set at 12.75°, which is suitable for an ACT to actuate the A0 mode in an aluminum plate with the frequency-thickness product of 0.3 MHz•mm.…”

Section: Sound Field Transmission and Receptionmentioning

confidence: 99%

Lamb Wave Local Wavenumber Approach for Characterizing Flat Bottom Defects in an Isotropic Thin Plate

Fan

Zhang

et al. 2018

Applied Sciences

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This paper aims to use the Lamb wave local wavenumber approach to characterize flat bottom defects (including circular flat bottom holes and a rectangular groove) in an isotropic thin plate. An air-coupled transducer (ACT) with a special incidence angle is used to actuate the fundamental anti-symmetric mode (A0). A laser Doppler vibrometer (LDV) is employed to measure the out-of-plane velocity over a target area. These signals are processed by the wavenumber domain filtering technique in order to remove any modes other than the A0 mode. The filtered signals are transformed back into the time-space domain. The space-frequency-wavenumber spectrum is then obtained by using three-dimensional fast Fourier transform (3D FFT) and a short space transform, which can retain the spatial information and reduce the magnitude of side lobes in the wavenumber domain. The average wavenumber is calculated, as a real signal usually contains a certain bandwidth instead of the singular frequency component. Both simulation results and experimental results demonstrate that the average wavenumber can be used not only to identify shape, location, and size of the damage, but also quantify the depth of the damage. In addition, the direction of an inclined rectangular groove is obtained by calculating the image moments under grayscale. This hybrid and non-contact system based on the local wavenumber approach can be provided with a high resolution.

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“…To measure mechanical properties of such a medium, the variation of the phase velocity of guided waves in the structure is a key factor to be addressed. In recent studies, the guided wave formulation is adopted in ultrasound elastography of thin-walled soft tissues 4,19,20 . The main hypothesis of this study is the bladder tissue can be considered as a pre-stressed thin shell with nonlinear elasticity behavior.…”

Section: Introductionmentioning

confidence: 99%

Acoustoelasticity Analysis of Transient Waves for Non-Invasive In Vivo Assessment of Urinary Bladder

Bayat

Adabi

Kumar

et al. 2019

Sci Rep

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A non-invasive method for measurement of the bladder wall nonlinear elastic behavior is presented. The method is based on acoustoelasticity modeling of the elasticity changes in bladder tissue modulus at different volumetric strain levels. At each volume, tissue strain is obtained from the real-time ultrasound images. Using acoustic radiation force, a transient Lamb wave is excited on the bladder wall and instantaneous modulus of shear elasticity is obtained from the 2-D Fourier analysis of the spatial-temporal dispersion maps. Measured elasticity and strain data are then used in an acoustoelasticity formulation to obtain the third order elastic coefficient, referred to as nonlinearity parameter A , and initial resting elasticity μ 0 . The method was tested in ex vivo porcine bladder samples (N = 9) before and after treatment with formalin. The estimated nonlinearity parameter, A , was significantly higher in the treated samples compared to intact ( p < 0.00062). The proposed method was also applied on 16 patients with neurogenic bladders (10 compliant and 6 non-compliant subjects). The estimated nonlinearity parameter A was significantly higher in the non-compliant cases compared to the compliant ( p < 0.0293). These preliminary results promise a new method for non-invasive evaluation of the bladder tissue nonlinearity which may serve as a new diagnostic and prognostic biomarker for management of the patients with neurogenic bladders.

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Characterization of material properties of soft solid thin layers with acoustic radiation force and wave propagation

Cited by 10 publications

References 31 publications

Mechanics of ultrasound elastography

Mechanics of ultrasound elastography

Lamb Wave Local Wavenumber Approach for Characterizing Flat Bottom Defects in an Isotropic Thin Plate

Acoustoelasticity Analysis of Transient Waves for Non-Invasive In Vivo Assessment of Urinary Bladder

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