Kelvin–Voigt Parameters Reconstruction of Cervical Tissue-Mimicking Phantoms Using Torsional Wave Elastography

Callejas, Antonio; Gómez, Armando Zuluaga; Faris, Inas H.; Melchor, Juan; Rus, Guillermo

doi:10.3390/s19153281

Cited by 18 publications

(14 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This induces shear stress acting tangentially to the urethral wall along its whole circumferential dimension, while avoiding compressional stress in any direction. Three previous studies did not observe the presence of any compressional waves using a similar wave generation mechanism [ 30 , 31 , 32 ].…”

Section: Methodsmentioning

confidence: 92%

Wave Propagation in a Fractional Viscoelastic Tissue Model: Application to Transluminal Procedures

Gómez

Rus

Saffari

2021

Sensors

Self Cite

View full text Add to dashboard Cite

In this article, a wave propagation model is presented as the first step in the development of a new type of transluminal procedure for performing elastography. Elastography is a medical imaging modality for mapping the elastic properties of soft tissue. The wave propagation model is based on a Kelvin Voigt Fractional Derivative (KVFD) viscoelastic wave equation, and is numerically solved using a Finite Difference Time Domain (FDTD) method. Fractional rheological models, such as the KVFD, are particularly well suited to model the viscoelastic response of soft tissue in elastography. The transluminal procedure is based on the transmission and detection of shear waves through the luminal wall. Shear waves travelling through the tissue are perturbed after encountering areas of altered elasticity. These perturbations carry information of medical interest that can be extracted by solving the inverse problem. Scattering from prostate tumours is used as an example application to test the model. In silico results demonstrate that shear waves are satisfactorily transmitted through the luminal wall and that echoes, coming from reflected energy at the edges of an area of altered elasticity, which are feasibly detectable by using the transluminal approach. The model here presented provides a useful tool to establish the feasibility of transluminal procedures based on wave propagation and its interaction with the mechanical properties of the tissue outside the lumen.

show abstract

Section: Methodsmentioning

confidence: 92%

Wave Propagation in a Fractional Viscoelastic Tissue Model: Application to Transluminal Procedures

Gómez

Rus

Saffari

2021

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…The technique is able to characterize the different layers of the tissue when there is a clear difference between the stiffness of both, since shear waves propagate more quickly in stiffer media. The path of torsional waves from the transmitter to the receiver depends on the tissue scanned; the methodology for the characterization of bilayer tissue mimicking phantoms using TWE can be found in the work of Callejas et al [22].…”

Section: Discussionmentioning

confidence: 99%

“…One important contribution of this work with respect to the prior is being able to compare the results of both techniques in the same frequency range. A second approach was done, in which a reconstruction of the Kelvin-Voigt (KV) viscoelastic parameters was performed using a Probabilistic Inverse Problem (PIP) approach in tissue mimicking hydrogel phantoms; the results obtained from the TWE technique were compared against the synthetic signals from a Finite Difference Time Domain (FDTD) [22]. The aim was to validate the efficacy of the proposed reconstruction method via PIP.…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic Biomarkers of Ex Vivo Liver Samples via Torsional Wave Elastography

et al. 2020

Self Cite

View full text Add to dashboard Cite

The clinical ultrasound community demands mechanisms to obtain the viscoelastic biomarkers of soft tissue in order to quantify the tissue condition and to be able to track its consistency. Torsional Wave Elastography (TWE) is an emerging technique proposed for interrogating soft tissue mechanical viscoelastic constants. Torsional waves are a particular configuration of shear waves, which propagate asymmetrically in-depth and are radially transmitted by a disc and received by a ring. This configuration is shown to be particularly efficient in minimizing spurious p-waves components and is sensitive to mechanical constants, especially in cylinder-shaped organs. The objective of this work was to validate (TWE) technique against Shear Wave Elasticity Imaging (SWEI) technique through the determination of shear wave velocity, shear moduli, and viscosity of ex vivo chicken liver samples and tissue mimicking hydrogel phantoms. The results of shear moduli for ex vivo liver tissue vary 1.69–4.0kPa using TWE technique and 1.32–4.48kPa using SWEI technique for a range of frequencies from 200 to 800Hz. Kelvin–Voigt viscoelastic parameters reported values of μ = 1.51kPa and η = 0.54Pa·s using TWE and μ = 1.02kPa and η = 0.63Pa·s using SWEI. Preliminary results show that the proposed technique successfully allows reconstructing shear wave velocity, shear moduli, and viscosity mechanical biomarkers from the propagated torsional wave, establishing a proof of principle and warranting further studies.

show abstract

“…Gaskets are made of rubber, which is a viscoelastic material. Mechanical models are often used to model the viscoelastic behavior of materials of varied biological [ 28 ] and engineering applications [ 29 ]. The Kelvin–Voigt model is one such model that combines spring and viscous damper in parallel to model the elastic behavior and energy dissipation, respectively.…”

Section: Multibody Model Of the Oscillating Groupmentioning

confidence: 99%

Washing Machine Dynamic Model to Prevent Tub Collision during Transient State

Sánchez-Tabuenca

Galé

Lladó

et al. 2020

Sensors

View full text Add to dashboard Cite

In horizontal-axis washing machines, the front gasket as well as the damping system are crucial owing to the possible collision of the tub with the housing during the transient period. However, most dynamic models for predicting tub motion focus on the steady state and consider only the suspension system without including the gasket. We conducted an experimental study to analyze the effect of the gasket on the transient motion of the tub. The results obtained indicate the necessity of implementing the gasket in the multibody model of a washing machine to accurately predict the tub behavior during this period. The gasket model is formed by a combination of Voigt elements. Stiffness parameters are determined using a load cell, and damping factors are estimated using a process that integrates Adams/View, Matlab optimization algorithms, and displacement measurements that are taken using accelerometers. A D-optimal design used to predict the effect of the gasket parameters reveals that the tub displacement is most sensitive to the changes in linear stiffness in the transversal direction. Finally, the model of the gasket provides a better approach for predicting the tub movement during resonance that can be used in the design phase to avoid tub collision.

show abstract

Kelvin–Voigt Parameters Reconstruction of Cervical Tissue-Mimicking Phantoms Using Torsional Wave Elastography

Cited by 18 publications

References 50 publications

Wave Propagation in a Fractional Viscoelastic Tissue Model: Application to Transluminal Procedures

Wave Propagation in a Fractional Viscoelastic Tissue Model: Application to Transluminal Procedures

Viscoelastic Biomarkers of Ex Vivo Liver Samples via Torsional Wave Elastography

Washing Machine Dynamic Model to Prevent Tub Collision during Transient State

Contact Info

Product

Resources

About