Spectrum analysis in carotid sonography

Zwiebel, William J.

doi:10.1016/0301-5629(87)90060-3

Cited by 61 publications

(30 citation statements)

References 26 publications

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“…It was shown that systolic velocity indices for low-grade and medium-grade stenoses (< 75 % area reduction and < 50 % diameter reduction, respectively) also correlated with the degree of stenosis. By contrast, the detection of poststenotic flow phenomena (spectral broadening, fill-in of the spectral window) is not suitable for identifying low-grade stenoses [56,57]. Even in the case of high-grade stenoses (> 75 % area reduction or > 50 % diameter reduction), relative (Table 3) [55].…”

Section: Pathological Findingsmentioning

confidence: 92%

“…Systematic studies have proven the general validity of using velocity indices for diagnosing lesions in the areas supplied by the carotid arteries (Table 2) [21,22,23,25,28,53,54,55,56]. It was shown that systolic velocity indices for low-grade and medium-grade stenoses (< 75 % area reduction and < 50 % diameter reduction, respectively) also correlated with the degree of stenosis.…”

Section: Pathological Findingsmentioning

confidence: 95%

“…Comparisons of angiography and Doppler ultrasound [22,55,56] reveal that a ratio of < 1.5±1.8 (internal carotid peak systolic velocity/peak systolic velocity in the prebulbar segment of the common carotid artery; IC-PSV/CCPSV) is equivalent to an internal carotid artery stenosis of less than 50 % diameter reduction (diagnostic accuracy of around 90 %). An index > 1.8 defines stenoses with a > 50 % diameter reduction.…”

Section: Pathological Findingsmentioning

confidence: 99%

See 2 more Smart Citations

Ultrasound examination of carotid and vertebral arteries

Landwehr¹,

Schulte

Voshage³

2001

Eur Radiol

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Ultrasound is the most widespread diagnostic procedure in obstructive disease of the arteries supplying the brain. The combined non-invasive information on morphology and function makes duplex ultrasound the procedure of choice in screening and follow-up of carotid artery disease. This review deals with all relevant aspects of color duplex ultrasound of the carotids and the vertebral arteries. After a short introduction into the clinical background, the paper focuses on aspects of examination technique. In the main part of the review the relevant ultrasound findings in carotid artery disease are discussed. The different methods for grading stenoses of the internal carotid artery are explained in detail. Other relevant pathologies, such as vertebral artery disease, dissection and aneurysms, are briefly mentioned. The clinical value of ultrasound in the work-up of carotid and vertebral artery disease is briefly discussed in comparison with other imaging procedures.

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Section: Pathological Findingsmentioning

confidence: 92%

Section: Pathological Findingsmentioning

confidence: 95%

Section: Pathological Findingsmentioning

confidence: 99%

See 1 more Smart Citation

Ultrasound examination of carotid and vertebral arteries

Landwehr¹,

Schulte

Voshage³

2001

Eur Radiol

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“…Doppler waveform analysis is often used as a diagnostic tool in the clinical assessment of disease. Spectral analysis is still a preferred method of displaying quantitative Doppler information [9]. The use of spectrum analysis to display Doppler frequency shift signals not only provided the best means of measuring blood-flow velocity but also information about the presence of disturbed flow [10].…”

Section: Introductionmentioning

confidence: 99%

Spectral Simulation Analysis of Doppler Ultrasound Blood Flow Signals from Local Expansion Artery

Wang

Huang

Tao

et al. 2010

2010 International Forum on Information Technology and Applications

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A simulation approach was proposed to analyze the spectra of Doppler signals in local expansion artery, which can provide a useful guidance for detecting the formation and growth progress of the aneurysms using the Doppler ultrasound technology and forecasting the size of aneurysm. Firstly, by solving Navier-Stokes equations, the velocity distributions in the vessels with various expansion degrees are calculated. Secondly, power spectral density (PSD) of the Doppler signals is estimated according to the relationship of velocity profiles and power spectral density. Finally, Doppler signals are generated using cosine-superposed methods. The results show that the spectra of Doppler signals are similar to those found in practice. Therefore, the proposed approach is useful for simulating the spectra of Doppler ultrasound signals.

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“…Doppler waveform analysis is often used as a diagnostic tool in the clinical assessment of disease. Spectral analysis is still a preferred method of displaying quantitative Doppler information (Zwiebel, 1987). The use of spectrum analysis to display Doppler frequency shift signals not only provided the best means of measuring blood-flow velocity and also information about the presence of disturbed flow (Green, 1964;Sigel, 1998).…”

Section: Introductionmentioning

confidence: 99%