Accuracy and Precision of a Plane Wave Vector Flow Imaging Method in the Healthy Carotid Artery

Jensen, Jørgen Arendt; Hoyos, Carlos Armando Villagómez; Traberg, Marie Sand; Olesen, Jacob Bjerring; Tomov, Borislav Gueorguiev; Moshavegh, Ramin; Holbek, Simon; Stuart, Matthias Bo; Ewertsen, Caroline; Hansen, Kristoffer Lindskov; Thomsen, Carsten; Nielsen, Michael Bachmann

doi:10.1016/j.ultrasmedbio.2018.03.017

Cited by 12 publications

(10 citation statements)

References 48 publications

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“…The inlet boundary conditions of the FSI models were obtained from the measured mean spatial velocity profile in each phantom. The principles of Womersley and Evans were used to reconstruct a smooth continuous velocity profile as a function of time and space [18], [19]. The outlet conditions were pressures adapted to deliver the measured volume flow in each branch.…”

Section: (Comsol Ab Stockholm Sweden)mentioning

confidence: 99%

Pressure Difference Estimation in Carotid Bulbs using Vector Flow Imaging - A Phantom Study

Nguyen

Traberg

Olesen³

et al. 2019

2019 IEEE International Ultrasonics Symposium (IUS)

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Section: (Comsol Ab Stockholm Sweden)mentioning

confidence: 99%

Pressure Difference Estimation in Carotid Bulbs using Vector Flow Imaging - A Phantom Study

Nguyen

Traberg

Olesen³

et al. 2019

2019 IEEE International Ultrasonics Symposium (IUS)

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“…Two settings of φ were used, 0 • and 45 • , to introduce velocities in both x and y-direction. Setup 2 consisted of a phantom made with tissue-mimicking material with a straight vessel in the center [20], [21]. The probe was positioned above the vessel with a transducer holder, keeping the probe steady during acquisition.…”

Section: Methodsmentioning

confidence: 99%

Full Volumetric 3-D Vector Flow Imaging using a 62+62 Row-Column Array

Schou

Jorgensen

Stuart

et al. 2019

2019 IEEE International Ultrasonics Symposium (IUS)

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Row Column (RC) Arrays can produce highresolution 3-D volumetric images with only 2N interconnections compared to N 2 for matrix probes. A 62+62 RC probe has four times larger surface area and one-eighth of the channel count when compared to the same-pitch fully populated 32x32 matrix probe. This research investigates the performance of such a prototype array for volumetric Synthetic Aperture (SA) B-mode and vector flow imaging using defocused waves. An interleaved SA sequence was implemented on the SARUS scanner using a 3 MHz, λ /2-pitch 62+62 RC piezoelectric probe. The sequence contains repeated emissions with rows and columns interleaved with B-mode emissions. The sequence contains 80 emissions in total and can provide a volume rate above 125 Hz yielding continuous data. Velocities were estimated using the Directional Transverse Oscillation Cross-Correlation method. Measurements were made on a circulating flow rig with a parabolic profile with a peak velocity of 0.25 m/s and beam-to-flow angle of 90 o , and two different rotation angles (0 o , 45 o). Results showed a maximum bias of-17.5% and a standard deviation of 3.9%. A second setup used a tissue mimicking phantom with pulsating flow showing full volumetric flow estimated using the method. The flow was visualized in the entire rectilinear volume at once, with B-mode planes selectable in the entire region. This was attained using only 62 channels in receive making full volumetric imaging and velocity estimation implementable on current scanner hardware.

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“…In principle, the technique requires a relatively large transducer aperture to allow sufficient distance between the separate virtual apertures. Transverse oscillations has been reported to achieve accurate results in superficial vessels and has been used to study flow in varicose veins (Bechsgaard et al 2018), the ascending aorta (peri-operatively) (Hansen et al 2013(Hansen et al , 2020, the carotid artery (in two dimensions [Jensen et al 2018] and three dimensions [Holbek et al 2016[Holbek et al , 2017) and the femoral artery (Hansen et al 2019). The smaller footprint of phased array transthoracic probes might hamper its use in echocardiography, although phased array implementations have been developed but use focused transmit beams, reducing the achievable frame rate (Pihl et al 2012;Holbek et al 2018).…”

Section: Native Blood Flow Imagingmentioning

confidence: 99%

Contrast-Enhanced High-Frame-Rate Ultrasound Imaging of Flow Patterns in Cardiac Chambers and Deep Vessels

Vos

Voorneveld

Jebbink

et al. 2020

Ultrasound in Medicine & Biology

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Cardiac function and vascular function are closely related to the flow of blood within. The flow velocities in these larger cavities easily reach 1 m/s, and generally complex spatiotemporal flow patterns are involved, especially in a non-physiologic state. Visualization of such flow patterns using ultrasound can be greatly enhanced by administration of contrast agents. Tracking the high-velocity complex flows is challenging with current clinical echographic tools, mostly because of limitations in signal-to-noise ratio; estimation of lateral velocities; and/ or frame rate of the contrast-enhanced imaging mode. This review addresses the state of the art in 2-D highframe-rate contrast-enhanced echography of ventricular and deep-vessel flow, from both technological and clinical perspectives. It concludes that current advanced ultrasound equipment is technologically ready for use in human contrast-enhanced studies, thus potentially leading to identification of the most clinically relevant flow parameters for quantifying cardiac and vascular function.

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Accuracy and Precision of a Plane Wave Vector Flow Imaging Method in the Healthy Carotid Artery

Cited by 12 publications

References 48 publications

Pressure Difference Estimation in Carotid Bulbs using Vector Flow Imaging - A Phantom Study

Pressure Difference Estimation in Carotid Bulbs using Vector Flow Imaging - A Phantom Study

Full Volumetric 3-D Vector Flow Imaging using a 62+62 Row-Column Array

Contrast-Enhanced High-Frame-Rate Ultrasound Imaging of Flow Patterns in Cardiac Chambers and Deep Vessels

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