ISSN:
1741-0444
Keywords:
Asymmetry of spectrum
;
Fast Fourier transform
;
Maximum likelihood method
;
Spectrum analysis
;
Stenosis differentiation
;
Turbulence intensity
;
Ultrasonic Doppler signal
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02441461
Permalink
