The ultrasound toolbox

Rodríguez-Molares, Alfonso; Rindal, Ole Marius Hoel; Bernard, Olivier; Liebgott, Hervé; Austeng, Andreas; Løvstakken, Lasse

doi:10.1109/ultsym.2017.8092026

Cited by 27 publications

(27 citation statements)

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“…The axial displacement map obtained using the Loupas algorithm [36,37] after post-processing the IQ (in-phase and quadrature data) of ex vivo liver sample I is shown in Figure 11. We can see the ARFI push and the shear wave propagation.…”

Section: Resultsmentioning

confidence: 99%

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Viscoelastic Biomarkers of Ex Vivo Liver Samples via Torsional Wave Elastography

et al. 2020

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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.

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Section: Resultsmentioning

confidence: 99%

“…Figure 6 shows a flow chart of how Verasonics generates SWEI and the steps needed to obtain the IQ data from an ARFI sequence. In this work, post-processing of the IQ data to obtain a displacement map was done using the Ultrasound Toolbox (USTB) [37].…”

Section: Tissue Motion Estimationmentioning

confidence: 99%

Viscoelastic Biomarkers of Ex Vivo Liver Samples via Torsional Wave Elastography

et al. 2020

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“…The beamforming was performed in MATLAB (Mathworks, Natick, MA) using The UltraSound ToolBox (USTB) [12]. Each transmit sequence was combined before applying the different beamforming methods briefly described above on the combined receive aperture.…”

Section: Methodsmentioning

confidence: 99%

The influence of speckle statistics on contrast metrics in ultrasound imaging

Hverven¹,

Rindal²,

Rodríguez-Molares³

et al. 2017

2017 IEEE International Ultrasonics Symposium (IUS)

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“…All processing has been done in MATLAB (Mathworks, Natick, MA) using the UltraSound ToolBox (USTB) [8]. For the STAI dataset, we first sum each transmit sequence and use the adaptive beamforming algorithms on the combined received aperture.…”

Section: Methodsmentioning

confidence: 99%

The dark region artifact in adaptive ultrasound beamforming

Rindal

Rodríguez-Molares

Austeng

2017

2017 IEEE International Ultrasonics Symposium (IUS)

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Abstract-An undesired effect, the dark region artifact (DRA), has been under-communicated in our research community. The DRA appear next to acoustically strong targets for some of the many adaptive beamformers introduced in the literature. This study investigates the DRA for a collection of adaptive beamformers and shows that this effect originates because some of the methods fail to estimate which signals arise in the mainlobe and which originates from sidelobes. The DRA results in darker regions in the ultrasound images, indicating the wrong acoustical amplitude. Therefore, the measured contrast can falsely appear higher for adaptive beamformers affected by the DRA.

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The ultrasound toolbox

Cited by 27 publications

References 0 publications

Viscoelastic Biomarkers of Ex Vivo Liver Samples via Torsional Wave Elastography

Viscoelastic Biomarkers of Ex Vivo Liver Samples via Torsional Wave Elastography

The influence of speckle statistics on contrast metrics in ultrasound imaging

The dark region artifact in adaptive ultrasound beamforming

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