Transient displacement induced in shear wave elastography: Comparison between analytical results and ultrasound measurements

Hachemi, M.; Callé, Samuel; Remeniéras, Jean-Pierre

doi:10.1016/j.ultras.2006.06.022

Cited by 21 publications

(9 citation statements)

References 11 publications

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“…A model based on the elastodynamic Green’s function formalism was considered to describe displacements at the surface of the elastic homogeneous half-space after a short acoustic pulse. There was good agreement between the results of phantom studies and theory (Hachemi et al, 2006). Nevertheless, to describe a mechanical response of biological tissues to an acoustic radiation force, depth inhomogeneity should also be taken into account.…”

Section: Introductionsupporting

confidence: 62%

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The dynamic deformation of a layered viscoelastic medium under surface excitation

et al. 2015

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In this study the dynamic behavior of a layered viscoelastic medium in response to the harmonic and impulsive acoustic radiation force applied to its surface was investigated both theoretically and experimentally. An analytical solution for a layered viscoelastic compressible medium in frequency and time domains was obtained using the Hankel transform. A special incompressible case was considered to model soft biological tissues. To verify our theoretical model, experiments were performed using tissue-like gel-based phantoms with varying mechanical properties. A 3.5 MHz single-element focused ultrasound transducer was used to apply the radiation force at the surface of the phantoms. A phase-sensitive optical coherence tomography (OCT) system was used to track the displacements of the phantom surface. Theoretically predicted displacements were compared with experimental measurements. The role of the depth dependence of the elastic properties of a medium in its response to an acoustic pulse at the surface was studied. It was shown that the low-frequency vibrations at the surface are more sensitive to the deep layers than high-frequency ones. Therefore, the proposed model in combination with spectral analysis can be used to evaluate depth-dependent distribution of the mechanical properties based on the measurements of the surface deformation.

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Section: Introductionsupporting

confidence: 62%

“…The influence of the temporal and spatial profiles of the stress source (radiation force) was studied previously (Hachemi et al, 2006). A model based on the elastodynamic Green’s function formalism was considered to describe displacements at the surface of the elastic homogeneous half-space after a short acoustic pulse.…”

Section: Introductionmentioning

confidence: 99%

The dynamic deformation of a layered viscoelastic medium under surface excitation

et al. 2015

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“…An axial displacement estimation routine is used with a window length of 2mm and 75% overlap. This procedure is repeated over the entire imaging plane to obtain a displacement vs. time profile at each pixel [41]. …”

Section: Methodsmentioning

confidence: 99%

Three-Dimensional Sheaf of Ultrasound Planes Reconstruction (SOUPR) of Ablated Volumes

Ingle

Varghese

2014

IEEE Trans. Med. Imaging

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This paper presents an algorithm for three dimensional reconstruction of tumor ablations using ultrasound shear wave imaging with electrode vibration elastography. Radiofrequency ultrasound data frames are acquired over imaging planes that form a subset of a sheaf of planes sharing a common axis of intersection. Shear wave velocity is estimated separately on each imaging plane using a piecewise linear function fitting technique with a fast optimization routine. An interpolation algorithm then computes velocity maps on a fine grid over a set of C-planes that are perpendicular to the axis of the sheaf. A full three dimensional rendering of the ablation can then be created from this stack of C-planes; hence the name “Sheaf Of Ultrasound Planes Reconstruction” or SOUPR. The algorithm is evaluated through numerical simulations and also using data acquired from a tissue mimicking phantom. Reconstruction quality is gauged using contrast and contrast-to-noise ratio measurements and changes in quality from using increasing number of planes in the sheaf are quantified. The highest contrast of 5 dB is seen between the stiffest and softest regions of the phantom. Under certain idealizing assumptions on the true shape of the ablation, good reconstruction quality while maintaining fast processing rate can be obtained with as few as 6 imaging planes suggesting that the method is suited for parsimonious data acquisitions with very few sparsely chosen imaging planes.

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“…This can partly be compensated for by using a gel stand-off on the patient. Shear waves are not generated within fluids, thus cystic structures cannot be adequately analysed[7]. The size of the region of interest may also potentially affect the shear wave measurements.…”

Section: Principles Of Elastographymentioning

confidence: 99%

Sonoelastography in the musculoskeletal system: Current role and future directions

Winn¹,

Lalam²,

Cassar‐Pullicino³

2016

WJR

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Ultrasound is an essential modality within musculoskeletal imaging, with the recent addition of elastography. The elastic properties of tissues are different from the acoustic impedance used to create B mode imaging and the flow properties used within Doppler imaging, hence elastography provides a different form of tissue assessment. The current role of ultrasound elastography in the musculoskeletal system will be reviewed, in particular with reference to muscles, tendons, ligaments, joints and soft tissue tumours. The different ultrasound elastography methods currently available will be described, in particular strain elastography and shear wave elastography. Future directions of ultrasound elastography in the musculoskeletal system will also be discussed.

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Transient displacement induced in shear wave elastography: Comparison between analytical results and ultrasound measurements

Cited by 21 publications

References 11 publications

The dynamic deformation of a layered viscoelastic medium under surface excitation

The dynamic deformation of a layered viscoelastic medium under surface excitation

Three-Dimensional Sheaf of Ultrasound Planes Reconstruction (SOUPR) of Ablated Volumes

Sonoelastography in the musculoskeletal system: Current role and future directions

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