Duplex carotid ultrasound

Acker, James D.; Cole, C. V.; Mauney, Keith; Joly, D; Machin, J E

doi:10.1007/bf00344109

Cited by 9 publications

(4 citation statements)

References 36 publications

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“…ZWIEBEL et al (26) also found external carotid imaging less satisfactory than internal carotid imaging. Calcification produces acoustic shadowing, hindering visualisation of the lumen, and the thrombus can be difficult to visualise due to its generally hypoechoic characteristics (1).…”

Section: Resultsmentioning

confidence: 99%

Duplex US of the External Carotid Artery

et al. 1996

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The ratio between the systolic peak velocities of the internal and common carotid arteries (vpICA/vpCCA), vpICA and grey-scale imaging measurement are generally used to evaluate internal carotid stenosis against known flow criteria in order to differentiate non-significant from significant stenosis. The same criteria are also used for evaluating the external carotid artery (ECA). Our data on 707 normal or stenotic ECA nevertheless showed that the systolic peak velocity of the normal ECA (vpECA) and its ratio to the systolic velocity of the CCA (vpECA/vpCCA) are higher than vpICA and vpICA/vpCCA. vpECA/vpCCA is about 2 in > 0-49% ECA stenosis. Only in severe stenosis are the peak velocities almost comparable. The ratio between the peak end diastolic velocities (edvECA/edvCCA) and edvECA proved to be unreliable, as did grey-scale imaging measurement of the external carotid stenosis. In addition, ipsi-lateral internal carotid stenosis greatly affects the non-stenotic external carotid flow values, and probably has the same effect on the flow values of a stenotic external artery. Thus, external carotid flow values must be considered carefully.

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Section: Resultsmentioning

confidence: 99%

Duplex US of the External Carotid Artery

et al. 1996

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“…6 Duplex ultrasound, the clinical standard to measure blood velocity by combining traditional and Doppler ultrasound, has an angle dependency, and flow information is limited to velocities in a specific sample volume inside the artery. 7,8 To our knowledge, there are five ultrasound imaging techniques that are promising for studying flow patterns in a carotid artery stent. Vector Doppler, where two (or more) apertures are acquired to obtain both the axial and lateral velocity components, overcomes the limitation of Doppler ultrasound of measuring velocity in only one direction.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In vitro performance of echoPIV for assessment of laminar flow profiles in a carotid artery stent

et al. 2021

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. Purpose : Detailed blood flow studies may contribute to improvements in carotid artery stenting. High-frame-rate contrast-enhanced ultrasound followed by particle image velocimetry (PIV), also called echoPIV, is a technique to study blood flow patterns in detail. The performance of echoPIV in presence of a stent has not yet been studied extensively. We compared the performance of echoPIV in stented and nonstented regions in an in vitro flow setup. Approach : A carotid artery stent was deployed in a vessel-mimicking phantom. High-frame-rate contrast-enhanced ultrasound images were acquired with various settings. Signal intensities of the contrast agent, velocity values, and flow profiles were calculated. Results : The results showed decreased signal intensities and correlation coefficients inside the stent, however, PIV analysis in the stent still resulted in plausible flow vectors. Conclusions : Velocity values and laminar flow profiles can be measured in vitro in stented arteries using echoPIV.

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“…The development of duplex scanning, combining grayscale B-mode imaging and pulse-wave Doppler to allow selective, image-guided Doppler sampling, further improved the accuracy of carotid sonography [12][13][14][15][16]. The latter part of the past decade saw the rapid development of color-flow duplex Doppler technology.…”

Section: Introductionmentioning

confidence: 99%

Color Velocity Imaging: Introduction to a New Ultrasound Technology

Tegeler

Kremkau²,

Hitchings

1991

Journal of Neuroimaging

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Noninvasive ultrasound is the preferred methodology for the initial evaluation of carotid atherosclerosis. Since the early use of continuous-wave Doppler to assess carotid artery flow velocity blindly, neurosonology has progressed through crude B-mode imaging, spectral analysis of the Doppler signal, and gray-scale duplex Doppler/B-mode imaging, to color-flow Doppler duplex imaging. The latter allows color coding of Doppler data based on the velocity of blood flow. The combination of color-flow Doppler with gray-scale B-mode imaging allows simultaneous visual display of anatomical and hemodynamic information. Physical limitations of color-flow duplex Doppler imaging may affect the clinical utility of these techniques. Problems with pulse repetition frequency, aliasing, resolution capability of the color data, and interpolation of data make some applications difficult. Color velocity imaging uses the data contained in the gray-scale B-mode image scan lines to determine velocity of blood flow, and it offers potential advantages over conventional color-flow duplex Doppler for the assessment of carotid atherosclerosis and hemodynamics. Initial comparison of spectral Doppler and color velocity imaging data suggests that the latter is an accurate method to assess blood flow velocity. Understanding of the validity, utility, and prognostic advantages offered by color velocity imaging awaits careful prospective clinical trials.

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Duplex carotid ultrasound

Cited by 9 publications

References 36 publications

Duplex US of the External Carotid Artery

Duplex US of the External Carotid Artery

In vitro performance of echoPIV for assessment of laminar flow profiles in a carotid artery stent

Color Velocity Imaging: Introduction to a New Ultrasound Technology

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