Journal ArticleDOI
Simultaneous quantification of flow and tissue velocities based on multi-angle plane wave imaging
Ingvild Kinn Ekroll,Abigail Swillens,Patrick Segers,Torbjørn Dahl,Hans Torp,Lasse Lovstakken +5 more
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TLDR
Using the high ensemble vector Doppler technique, blood flow through stenoses and secondary flow patterns were better visualized than in ordinary color doppler, and the full velocity spectrum could be obtained retrospectively for arbitrary points in the image.Abstract:
A quantitative angle-independent 2-D modality for flow and tissue imaging based on multi-angle plane wave acquisition was evaluated. Simulations of realistic flow in a carotid artery bifurcation were used to assess the accuracy of the vector Doppler (VD) technique. Reduction in root mean square deviation from 27 cm/s to 6 cm/s and 7 cm/s to 2 cm/s was found for the lateral (vx) and axial (vz) velocity components, respectively, when the ensemble size was increased from 8 to 50. Simulations of a Couette flow phantom (vmax = 2.7 cm/s) gave promising results for imaging of slowly moving tissue, with root mean square deviation of 4.4 mm/s and 1.6 mm/s for the x- and z-components, respectively. A packet acquisition scheme providing both B-mode and vector Doppler RF data was implemented on a research scanner, and beamforming and further post-processing was done offline. In vivo results of healthy volunteers were in accordance with simulations and gave promising results for flow and tissue vector velocity imaging. The technique was also tested in patients with carotid artery disease. Using the high ensemble vector Doppler technique, blood flow through stenoses and secondary flow patterns were better visualized than in ordinary color Doppler. Additionally, the full velocity spectrum could be obtained retrospectively for arbitrary points in the image.read more
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Journal ArticleDOI
Ultrafast imaging in biomedical ultrasound
Mickael Tanter,Mathias Fink +1 more
TL;DR: In this article, the basic principles and implementation of ultrafast imaging in biomedical ultrasound are illustrated and discussed in particular, present and future applications of ultra-fast imaging for screening, diagnosis, and therapeutic monitoring.
Journal ArticleDOI
3D ultrafast ultrasound imaging in vivo.
Jean Provost,Clement Papadacci,Juan Esteban Arango,Marion Imbault,Mathias Fink,Jean-Luc Gennisson,Mickael Tanter,Mathieu Pernot +7 more
TL;DR: The potential of 3D Ultrafast Ultrasound Imaging for the 3D mapping of stiffness, tissue motion, and flow in humans in vivo is demonstrated and promises new clinical applications of ultrasound with reduced intra--and inter-observer variability.
Journal ArticleDOI
High-contrast ultrafast imaging of the heart
TL;DR: Spatial coherent compounding provided a strong improvement of the imaging quality, even with a small number of transmitted diverging waves and a high frame rate, which allows imaging of the propagation of electromechanical and shear waves with good image quality.
Journal ArticleDOI
Vector Projectile Imaging: Time-Resolved Dynamic Visualization of Complex Flow Patterns
TL;DR: A new ultrasound-based framework called vector projectile imaging (VPI) that can dynamically render complex flow patterns over an imaging view at millisecond time resolution is presented and suggests that VPI holds promise as a new tool for complex flow analysis.
Journal ArticleDOI
Ultrasound Vector Flow Imaging—Part II: Parallel Systems
TL;DR: The underlying acquisition and estimation methods for fast 2-D and 3-D velocity imaging for flow imaging are explained and a number of examples are given.
References
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Journal ArticleDOI
Real-Time Two-Dimensional Blood Flow Imaging Using an Autocorrelation Technique
TL;DR: In this paper, a new blood row imaging system is described that com- bines a conventional pulsed Doppler device and a newly developed AU-to-correlator, in which the direction of blood Row and its variance are expressed by means of a difference in color and its hue, respectively.
Real-Time Two-Dimensional Blood Flow Imaging Using an Autocorrelation Technique
TL;DR: In the system blood flow within a given cross section of a live organ is displayed in real time and the direction of blood Row and its variance are expressed by means of a difference in color and its hue, respectively.
Journal ArticleDOI
A new method for estimation of velocity vectors
Jørgen Arendt Jensen,Peter Munk +1 more
TL;DR: A new method for determining the velocity vector of a remotely sensed object using either sound or electromagnetic radiation based on the principle of using transverse spatial modulation for making the received signal influenced by transverse motion is described.
Journal ArticleDOI
Angle Independent Ultrasonic Detection of Blood Flow
TL;DR: A new technique for blood velocity imaging based on tracking the motion of the speckle pattern produced by blood, which unlike Doppler velocity determinations, these are angle independent.
Journal ArticleDOI
Atherosclerotic plaque rupture in symptomatic carotid artery stenosis.
TL;DR: As in the coronary artery system, rupture of the atherosclerotic plaque may play an important role in the pathogenesis of ischemic stroke caused by carotid artery stenosis.