Asymmetry of Doppler spectrum in stenosis differentiation |
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Authors: | K. Kaluzynski A. Tedgui |
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Affiliation: | 1. Biomedical Engineering Group, IBSPiE, Warsaw Technical University, ul. Chodkiewicza 8, 02-525, Warsaw, Poland 2. Institut National de la Santé et de la Recherche Médicale, Unité 141, H?pital Lariboisière, 41 bd de la Chapelle, 75475, Paris Cedex 10, France
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Abstract: | The asymmetry of the spectral distribution of ultrasonic Doppler flow velocity signals, assessed using the coefficient of skewness, is discussed as a criterion of stenosis differentiation. Its performance is compared with that of the index of turbulence intensity for both in vitro and in vivo flow Doppler signals, recorded distal to a stenosis. The power spectral distributions are computed using the direct Fourier transform and maximum likelihood method. The asymmetry of spectral distribution has proved to be a more efficient criterion than the turbulence intensity. The maximum likelihood method ensures better stenosis differentiation than the direct FFT method. |
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Keywords: | Asymmetry of spectrum Fast Fourier transform Maximum likelihood method Spectrum analysis Stenosis differentiation Turbulence intensity Ultrasonic Doppler signal |
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