Two Point Method For Robust Shear Wave Phase Velocity Dispersion Estimation of Viscoelastic Materials

Piotr Kijanka, Lukasz Ambrozinski, Matthew W Urban

Research output: Contribution to journalArticle

Abstract

Ultrasound shear wave elastography (SWE) is an imaging modality used for noninvasive, quantitative evaluation of tissue mechanical properties. SWE uses an acoustic radiation force to produce laterally propagating shear waves that can be tracked in spatial and temporal domains in order to obtain the wave velocity. One of the ways to study the viscoelasticity is through examining the shear wave velocity dispersion curves. In this paper, we present an alternative method to two-dimensional Fourier transform (2D-FT). Our unique approach (2P-CWT) considers shear wave propagation measured in two lateral locations only and uses wavelet transformation analysis. We used the complex Morlet wavelet function as the mother wavelet to filter two shear waves at different locations. We examined how the first signal position and the distance between the two locations affect the shear wave velocity dispersion estimation in 2P-CWT. We tested this new method on a digital phantom data created using the local interaction simulation approach (LISA) in viscoelastic media with and without added white Gaussian noise to the wave motion. Moreover, we tested data acquired from custom made tissue mimicking viscoelastic phantom experiments and ex vivo porcine liver measurements. We compared results from 2P-CWT with the 2D-FT technique. 2P-CWT provided dispersion curves estimation with lower errors over a wider frequency band in comparison to 2D-FT. Tests conducted showed that the two-point technique gives results with better accuracy in simulation results and can be used to measure phase velocity of viscoelastic materials.

Original languageEnglish (US)
JournalUltrasound in Medicine and Biology
DOIs
StatePublished - Jan 1 2019

Fingerprint

Elasticity Imaging Techniques
phase velocity
S waves
Wavelet Analysis
Fourier Analysis
Acoustics
Swine
Radiation
Liver
viscoelasticity
curves
random noise
sound waves
liver
wave propagation
simulation
mechanical properties
filters
evaluation
Ultrasonic Waves

Keywords

  • Continuous wavelet transform (CWT)
  • Shear wave elastography (SWE)
  • Soft tissue
  • Ultrasound
  • Velocity dispersion curves
  • Viscoelastic
  • Viscosity

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Biophysics
  • Acoustics and Ultrasonics

Cite this

Two Point Method For Robust Shear Wave Phase Velocity Dispersion Estimation of Viscoelastic Materials. / Kijanka, Piotr; Ambrozinski, Lukasz; Urban, Matthew W.

In: Ultrasound in Medicine and Biology, 01.01.2019.

Research output: Contribution to journalArticle

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