Effect of method and parameters of spectral analysis on selected indices of simulated doppler spectra

The sensitivity of Doppler spectral indices (mean frequency, maximum frequency, spectral broadening index and turbulence intensity) to the conditions of spectral analysis (estimation method, data window, smoothing window or model order) increases with decreasing signal bandwidth and growing index co...

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Bibliographic Details
Published in:Medical & biological engineering & computing 1993-05, Vol.31 (3), p.249-256
Main Authors: KALUZYNSKI, K, PALKO, T
Format: Article
Language:English
Subjects:
Arteries - diagnostic imaging
Biological and medical sciences
Cardiovascular system
Electricity
Humans
Investigative techniques, diagnostic techniques (general aspects)
Medical sciences
Signal Processing, Computer-Assisted
Ultrasonic investigative techniques
Ultrasonography
Vascular Diseases - diagnostic imaging
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Summary:The sensitivity of Doppler spectral indices (mean frequency, maximum frequency, spectral broadening index and turbulence intensity) to the conditions of spectral analysis (estimation method, data window, smoothing window or model order) increases with decreasing signal bandwidth and growing index complexity. The bias of spectral estimate has a more important effect on these indices than its variance. A too low order, in the case of autoregressive modeling and minimum variance methods, and excessive smoothing, in the case of the FFT method, result in increased errors of Doppler spectral indices. There is a trade-off between the errors resulting from a short data window and those due to insufficient temporal resolution.
ISSN:0140-0118
1741-0444
DOI:10.1007/BF02458044