Spectral analysis of arterial bruits (phonoangiography): experimental validation.

Miller, A; Lees, Robert S.; Kistler, J P; Abbott, W M

doi:10.1161/01.cir.61.3.515

Cited by 22 publications

(2 citation statements)

References 4 publications

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“…Also several in vitro studies are conducted to examine this subject from different perspectives. [10][11][12][13][14][15][16][17][18][19][20] They all confirmed that the source of vascular murmurs is high-frequency pressure fluctuations occurring after stenosis. In addition, they showed that the intensity of acoustic radiation is directly related to the flow rate and the stenosis severity.…”

Section: Introductionmentioning

confidence: 86%

Numerical investigation of wall pressure fluctuations downstream of concentric and eccentric blunt stenosis models

Ozden

Sert

Yazıcıoğlu

2019

Proc Inst Mech Eng H

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Pressure fluctuations that cause acoustic radiation from vessel models with concentric and eccentric blunt stenoses are investigated. Large eddy simulations of non-pulsatile flow condition are performed using OpenFOAM. Calculated amplitude and spatial-spectral distribution of acoustic pressures at the post-stenotic region are compared with previous experimental and theoretical results. It is found that increasing the Reynolds number does not change the location of the maximum root mean square wall pressure, but causes a general increase in the spectrum level, although the change in the shape of the spectrum is not significant. On the contrary, compared to the concentric model at the same Reynolds number, eccentricity leads to an increase both at the distance of the location of the maximum root mean square wall pressure from the stenosis exit and the spectrum level. This effect becomes more distinct when radial eccentricity of the stenosis increases. Both the flow rate and the eccentricity of the stenosis shape are evaluated to be clinically important parameters in diagnosing stenosis.

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Section: Introductionmentioning

confidence: 86%

Numerical investigation of wall pressure fluctuations downstream of concentric and eccentric blunt stenosis models

Ozden

Sert

Yazıcıoğlu

2019

Proc Inst Mech Eng H

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“…Results from in vitro and in vivo experiments as in [6], [7], [8] show that the frequency peaks introduced by stenosis in the bruits spectra are close to the characteristic frequencies of vortex formation in the disturbed region behind a stenosis and the resonance frequencies of vibration of the post stenotic segment. The location of the peaks in the first group is influenced by the flow while the latter is not.…”

Section: Introductionmentioning

confidence: 99%

Frequency tracking of resonant-like sounds from audio recordings of arterio-venous fistula stenosis

Obando

Mandersson

2012

2012 IEEE International Conference on Bioinformatics and Biomedicine Workshops

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In this work we study in time-frequency domain what has been termed "tea-kettle" sounds found in audio recordings of arteriovenous fistulas with severe stenosis. These sounds appears as frequency modulated signals (chirps) in the timefrequency plots. We first developed a simple model for generating synthetic bruits containing chirps. Then we performed tracking of the time-varying frequency signals using an Extended Kalman filter (EKF). Finally we analyzed a data base of recordings from 5 patients suffering from venous stenosis EKF frequency tracker, the results shows the chirps mean frequencies (fundamental) can vary in a rather wide range of frequencies from about 200 Hz to 600 Hz and that up to two harmonics can also be found in the considered cases.

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Medical Acoustics

Beach¹,

Dunmire²

2007

Springer Handbook of Acoustics

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Spectral analysis of arterial bruits (phonoangiography): experimental validation.

Cited by 22 publications

References 4 publications

Numerical investigation of wall pressure fluctuations downstream of concentric and eccentric blunt stenosis models

Numerical investigation of wall pressure fluctuations downstream of concentric and eccentric blunt stenosis models

Frequency tracking of resonant-like sounds from audio recordings of arterio-venous fistula stenosis

Medical Acoustics

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