Angle Independent Ultrasonic Detection of Blood Flow

Trahey, Gregg E.; Allison, John W.; Ramm, Olaf T. von

doi:10.1109/tbme.1987.325938

Cited by 367 publications

(185 citation statements)

References 7 publications

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“…Displacement data were processed off-line by performing 1D cross-correlation in the fast-time dimension between a reference tracking beam and sequentially acquired tracking beams transmitted after the application of radiation force (Trahey et al 1987, O'Donnell et al 1994. Each tracking line was divided into a series of search regions, and the location of the peak in the cross-correlation function between a 0.92 mm kernel in the first tracking line and a search region in the next tracking line was used to estimate axial tissue displacement in that region.…”

Section: Image Processing and Visualizationmentioning

confidence: 99%

Liver ablation guidance with acoustic radiation force impulse imaging: challenges and opportunities

et al. 2006

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Previous studies have established the feasibility of monitoring radiofrequency (RF) ablation procedures with acoustic radiation force impulse (ARFI) imaging. However, questions remained regarding the utility of the technique in clinically realistic scenarios and at scanning depths associated with abdominal imaging in adults. We address several of these issues and detail recent progress towards the clinical relevance of the ARFI technique. Results from in vitro bovine tissues and an in vivo ovine model are presented. Additional experiments were conducted with a tissue-mimicking phantom and parallel receive tracking techniques in order to further support the clinical feasibility of the method. Thermal lesions created during RF ablation are visualized with high contrast in both in vitro and in vivo hepatic tissues, and radial lesion growth can be monitored throughout the duration of the procedure. ARFI imaging is implemented on a diagnostic ultrasonic scanner, and thus may be a convenient option to guide RF ablation procedures, particularly when electrode insertion is also performed with sonographic guidance.

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Section: Image Processing and Visualizationmentioning

confidence: 99%

Liver ablation guidance with acoustic radiation force impulse imaging: challenges and opportunities

et al. 2006

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“…Ultrasound speckle velocimetry (USV) allows flow imaging with a high spatial resolution and a negligible angle dependency (Bohs et al 1993(Bohs et al , 1995Sandrin et al 2001;Trahey et al 1987). The USV technique enables assessment of 2D velocity vectors by analyzing the acoustic speckle pattern of the flow field.…”

Section: Introductionmentioning

confidence: 99%

Perpendicular ultrasound velocity measurement by 2D cross correlation of RF data. Part A: validation in a straight tube

et al. 2010

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An ultrasound velocity assessment technique was validated, which allows the estimation of velocity components perpendicular to the ultrasound beam, using a commercially available ultrasound scanner equipped with a linear array probe. This enables the simultaneous measurement of axial blood velocity and vessel wall position, rendering a viable and accurate flow assessment. The validation was performed by comparing axial velocity profiles as measured in an experimental setup to analytical and computational fluid dynamics calculations. Physiologically relevant pulsating flows were considered, employing a blood analog fluid, which mimics both the acoustic and rheological properties of blood. In the core region (|r|/a \ 0.9), an accuracy of 3 cm s -1 was reached. For an accurate estimation of flow, no averaging in time was required, making a beat to beat analysis of pulsating flows possible.

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“…Extensive research has been done on 2D flow imaging, mainly focusing on two research lines: speckle tracking (ST) (Trahey et al, 1987) and crossed-beam vector Doppler (VD) (Fox, 1978). The former relies on tracking the movement of speckle patterns, created by the interference of the ultrasonic waves backscattered by the red blood cells.…”

Section: Introduction and Literaturementioning

confidence: 99%

Two-Dimensional Flow Imaging in the Carotid Bifurcation Using a Combined Speckle Tracking and Phase-Shift Estimator: A Study Based on Ultrasound Simulations and in vivo Analysis

Swillens

Segers

Løvstakken

2010

Ultrasound in Medicine & Biology

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A 2D blood velocity estimator is presented combining speckle tracking (ST) and phase-shift estimation (PE) to measure lateral (vx) and axial (vz) velocities respectively. Estimator properties were assessed in a carotid bifurcation using ultrasound simulations based on computational fluid dynamics, allowing validation towards a ground truth. Simulation results were supported with in vivo data of a healthy carotid. ST and PE estimates were combined as: 1) vx from 2D-ST and vz from PE, 2) vx from 2D-ST and vz from PE with aliasing correction based on ST, 3) vz from PE and only lateral ST for vx. Regression analysis showed a 35-77 % decrease in standard deviation for vz for PE compared to ST. Aliasing correction based on ST improved results but also introduced spurious artifacts. A marginal decrease in performance was observed when only tracking laterally. Further work will focus on in vivo trials in patients with carotid plaques.

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Angle Independent Ultrasonic Detection of Blood Flow

Cited by 367 publications

References 7 publications

Liver ablation guidance with acoustic radiation force impulse imaging: challenges and opportunities

Liver ablation guidance with acoustic radiation force impulse imaging: challenges and opportunities

Perpendicular ultrasound velocity measurement by 2D cross correlation of RF data. Part A: validation in a straight tube

Two-Dimensional Flow Imaging in the Carotid Bifurcation Using a Combined Speckle Tracking and Phase-Shift Estimator: A Study Based on Ultrasound Simulations and in vivo Analysis

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