Investigation of Ultrasound-Measured Flow Rate and Wall Shear Rate in Wrist Arteries Using Flow Phantoms

Zhou, Xiaowei; Xia, Chunming; Khan, Faisel; Corner, George; Huang, Zhihong; Hoskins, Peter

doi:10.1016/j.ultrasmedbio.2015.10.016

Cited by 11 publications

(7 citation statements)

References 35 publications

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“…[ 23 24 ] This process effectively produces the Doppler signal backscatter from the sample length which should be low and <2.5 mm. [ 25 ] Then, the Doppler signal is cross over a wall filter which is should be low,[ 25 ] and its main function is to reject any noise in the signal caused by low frequency identical to constant or very slow-moving tissue, inclusive a part of the vessel wall (s). [ 12 23 ] The filtered products are then come into a spectrum.…”

Section: T Echnical O Bservance and mentioning

confidence: 99%

A review of medical doppler ultrasonography of blood flow in general and especially in common carotid artery

et al. 2018

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Medical Doppler ultrasound is usually utilized in the clinical adjusting to evaluate and estimate blood flow in both the major (large) and the minor (tiny) vessels of the body. The normal and abnormal sign waveforms can be shown by spectral Doppler technique. The sign waveform is individual to each vessel. Thus, it is significant for the operator and the clinicians to understand the normal and abnormal diagnostic in a spectral Doppler show. The aim of this review is to explain the physical principles behind the medical Doppler ultrasound, also, to use some of the mathematical formulas utilized in the medical Doppler ultrasound examination. Furthermore, we discussed the color and spectral flow model of Doppler ultrasound. Finally, we explained spectral Doppler sign waveforms to show both the normal and abnormal signs waveforms that are individual to the common carotid artery, because these signs are important for both the radiologist and sonographer to perceive both the normal and abnormal in a spectral Doppler show.

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Section: T Echnical O Bservance and mentioning

confidence: 99%

A review of medical doppler ultrasonography of blood flow in general and especially in common carotid artery

et al. 2018

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“…To our knowledge, it is the first time for a study to directly measure the volumetric flow from its 2-D velocity profile in the presence of reverse flow, by a 1-D array probe without the need to assume the flow profile in the vessel or to obtain the knowledge of the beam angle relative to the vessel. Most other ultrasound techniques using a 1-D array transducer must assume an analytical or symmetric velocity profile, based on which the flow volume is estimated either from the velocity measurements at a point by spectral Doppler (Zhou et al 2016) or from 2-D velocities by vector flow techniques in the longitudinal scanning plane (Jensen and Munk, 1998, Yiu and Yu, 2016, Leow and Tang, 2018). The proposed ultrasound method in this study has overcome those limitations with a conventional 1-D array ultrasound transducer, which makes it easy to implement.…”

Section: Discussionmentioning

confidence: 99%

Measurement of Flow Volume in the Presence of Reverse Flow with Ultrasound Speckle Decorrelation

Zhou

Leow

et al. 2019

Ultrasound in Medicine & Biology

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Direct measurement of volumetric flow rate in the cardiovascular system with ultrasound is valuable but has been a challenge because most current 2-D flow imaging techniques are only able to estimate the flow velocity in the scanning plane (in-plane). Our recent study demonstrated that high frame rate contrast ultrasound and speckle decorrelation (SDC) can be used to accurately measure the speed of flow going through the scanning plane (through-plane). The volumetric flow could then be calculated by integrating over the luminal area, when the blood vessel was scanned from the transverse view. However, a key disadvantage of this SDC method is that it cannot distinguish the direction of the through-plane flow, which limited its applications to blood vessels with unidirectional flow. Physiologic flow in the cardiovascular system could be bidirectional due to its pulsatility, geometric features, or under pathologic situations. In this study, we proposed a method to distinguish the through-plane flow direction by inspecting the flow within the scanning plane from a tilted transverse view. This method was tested on computer simulations and experimental flow phantoms. It was found that the proposed method could detect flow direction and improved the estimation of the flow volume, reducing the overestimation from over 100% to less than 15% when there was flow reversal. This method showed significant improvement over the current SDC method in volume flow estimation and can be applied to a wider range of clinical applications where bidirectional flow exists.

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“…The two flow phantoms provide very close acoustic matching to soft tissue, arterial wall and blood, which is essential in studies on validation of key measured quantities such as diameter, maximum velocity, mean velocity, wall shear rate and volumetric flow [15,25]. The sizes of the vessel, vessel depth in the TMM, flow rate and the flow waveform can all be adapted to suit different applications.…”

Section: Overallmentioning

confidence: 99%

Fabrication of Two Flow Phantoms for Doppler Ultrasound Imaging

Zhou

Kenwright

Wang

et al. 2017

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Investigation of Ultrasound-Measured Flow Rate and Wall Shear Rate in Wrist Arteries Using Flow Phantoms

Abstract: Abstract-The aim of this study is to evaluate the errors in measurement of

Cited by 11 publications

References 35 publications

A review of medical doppler ultrasonography of blood flow in general and especially in common carotid artery

A review of medical doppler ultrasonography of blood flow in general and especially in common carotid artery

Measurement of Flow Volume in the Presence of Reverse Flow with Ultrasound Speckle Decorrelation

Fabrication of Two Flow Phantoms for Doppler Ultrasound Imaging

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