Time-Aligned Plane Wave Compounding Methods for High-Frame-Rate Shear Wave Elastography: Experimental Validation and Performance Assessment on Tissue Phantoms

Capriotti, Margherita; Urban, Matthew W.

doi:10.1016/j.ultrasmedbio.2021.03.003

Cited by 14 publications

(4 citation statements)

References 41 publications

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“…Overall, accuracy is lower at higher frequencies and at higher velocities, due to the increase in particle velocity measurement errors and limitations from the effective PRF. In fact, as noted in Capriotti et al (2021), while the PWC MA imaging approach extends the enabled frequency range ideally to the full PRF, accuracy decreases closer to the effective PRF (PRF/number of angled views).…”

Section: Discussionmentioning

confidence: 85%

“…The pulse repetition period was 85 μs, providing an effective pulse repetition frequency (PRF e ) of (11.765/3=3.922) kHz. The in-phase/quadrature (IQ) data from each acquired plane wave transmission was saved and was processed offline with a moving average PWC algorithm (Capriotti et al 2021) to allow for the recovery of motion with full PRF, without losing the signal-to-noise ratio gains achieved using PWC. The motion was estimated using the two-dimensional (2D) cross-correlator (Loupas et al 1995) for the entire FOV, using a spatial and temporal averaging window of 3 and 2 samples, respectively.…”

Section: Methodsmentioning

confidence: 99%

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The influence of acoustic radiation force beam shape and location on wave spectral content for arterial dispersion ultrasound vibrometry

Capriotti¹,

Roy²,

Hugenberg³

et al. 2022

Phys. Med. Biol.

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Objective: Arterial dispersion ultrasound vibrometry (ADUV) relies on the use of guided waves in arterial geometries for shear wave elastography measurements. Both the generation of waves through the use of acoustic radiation force (ARF) and the techniques employed to infer the speed of the resulting wave motion affect the spectral content and accuracy of the measurement. In particular, the effects of the shape and location of the ARF beam in ADUV have not been widely studied. In this work, we investigated how such variations of the ARF beam affect the induced motion and the measurements in the dispersive modes that are excited. Approach: The study includes an experimental evaluation on an arterial phantom and an in vivo validation of the observed trends, observing the two walls of the waveguide, simultaneously, when subjected to variations in the ARF beam extension (F/N) and focus location. Main Results: Relying on the theory of guided waves in cylindrical shells, the shape of the beam controls the selection and nature of the induced modes, while the location affects the measured dispersion curves (i.e., variation of phase velocity with frequency or wavenumber, multiple modes) across the waveguide walls. Significance: This investigation is important to understand the spectral content variations in ADUV measurements and to maximize inversion accuracy by tuning the ARF beam settings in clinical applications.

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Section: Discussionmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

The influence of acoustic radiation force beam shape and location on wave spectral content for arterial dispersion ultrasound vibrometry

Capriotti¹,

Roy²,

Hugenberg³

et al. 2022

Phys. Med. Biol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Because three angles are used to reconstruct one frame with PWC, the effective pulse repetition frequency (PRF e ) is 4.17 kHz. The in-phase/quadrature (IQ) data from each acquired plane wave transmission was saved and processed offline with a time-aligned PWC algorithm to allow for the recovery of motion with full frame rate (Capriotti et al 2021). The motion was estimated using a one-dimensional autocorrelation method (Kasai et al 1985), using spatial and temporal averaging windows with sizes of 3×2 pixels, respectively.…”

Section: Methodsmentioning

confidence: 99%

Measurement of wave propagation through a tube using dual transducers for elastography in arteries

Lee¹,

Capron²,

Liu³

et al. 2022

Phys. Med. Biol.

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Objective. Measuring waves induced with acoustic radiation force (ARF) in arteries has been studied over the last decade. To date, it remains a challenge to quantitatively assess the local arterial biomechanical properties. The cylindrical shape and waveguide behavior of waves propagating in the arterial wall pose complexities to determining the mechanical properties of the artery. Approach. In this paper, an artery-mimicking tube in water is examined utilizing three-dimensional measurements. The cross-section of the tube is measured while a transducer is translated over 41 different positions along the length of the tube. Motion in the radial direction is calculated using two components of motion which are measured from the two orthogonal views of the cross-section. This enables more accurate estimation of motion along the circumference of tube. Main results. The results provide more information to categorize the motion in tube wall into two types of responses: a transient response and a steady state response. The transient response is caused by ARF application and the waves travel along the length of the tube for a relatively short period of time. This corresponds to the axial and circumferential propagating waves. The two circumferential waves travel along the circumference of tube in CW (clockwise) and CCW (counter-clockwise) direction and result in a standing wave. By using a directional filter, the two waves were successfully separated, and their propagation was more clearly visualized. As a steady state response, a circumferential mode is generated showing a symmetric motion (i.e., the proximal and distal walls move in the opposite direction) following the transient response. Significance. This study provides a more comprehensive understanding of the waves produced in an artery-mimicking tube with ARF application, which will provide opportunities for improving measurement of arterial mechanical properties.

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“…Pixel-based in-phase & quadrature (IQ) data were formed via the built-in processing routine of the Vantage system. The acquired data were then compounded in a moving-averaging manner (Capriotti et al 2021) to make shear wave signal sampling rate equal to the PRF (10 kHz). Axial particle velocity signals at every pixel were extracted from the acquired data using the 1D windowed normalized cross-correlation (WNCC) algorithm with a 2.0-λ kernel (0.616 mm) based on progressive referencing (Deng et al 2017), where λ is the tracking ultrasound wavelength.…”

Section: Real Phantom Studymentioning

confidence: 99%

Ultrasound shear wave phase velocity imaging using black-box system identification (BSI): a data-driven approach

et al. 2023

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Objective. Shear wave elasticity imaging (SWEI) is an established approach for diagnosing lesions in human tissue. However, the shear wavelengths used by traditional SWEI are usually not short enough, leading to inferior accuracy in small-target (<10 mm) reconstruction. To exploit short shear wavelengths (high-frequency content), this study introduces a new phase velocity (PV) estimation technique as an alternative to the conventional group velocity (GV) modality. Approach. We propose using a black-box model instead of a fully physics-based model to describe the transition process of two arbitrary shear wave signals. With this representation, local PV can be obtained via black-box system identification (BSI). For validation, two PV estimation scenarios were established: (numerical) dispersion measurements in viscoelastic media, and (real) imaging targets in a CIRS elasticity phantom. BSI was compared with a state-of-the-art PV imaging method that uses local wavenumber estimation (LWE). Main results. BSI showed excellent accuracy in the dispersion estimation for all three viscoelastic media in the simulations. In the phantom study, the two PV methods exhibited good agreement in the frequency dependence of target quantification, and could both generate a higher target reconstruction accuracy than GV. LWE images were strongly affected by noise-induced faulty estimates, whereas BSI showed no notable artifacts. Significance. This study demonstrates the advantage of the PV modality over the GV modality as the former can achieve better target visualization by increasing imaging frequency. It also implies the feasibility of data-driven modeling for soft tissue characterization.

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Time-Aligned Plane Wave Compounding Methods for High-Frame-Rate Shear Wave Elastography: Experimental Validation and Performance Assessment on Tissue Phantoms

Cited by 14 publications

References 41 publications

The influence of acoustic radiation force beam shape and location on wave spectral content for arterial dispersion ultrasound vibrometry

The influence of acoustic radiation force beam shape and location on wave spectral content for arterial dispersion ultrasound vibrometry

Measurement of wave propagation through a tube using dual transducers for elastography in arteries

Ultrasound shear wave phase velocity imaging using black-box system identification (BSI): a data-driven approach

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