Time-domain estimation of the center frequency and spread of Doppler spectra in diagnostic ultrasound
- 1 July 1988
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
- Vol. 35 (4), 484-497
- https://doi.org/10.1109/58.4186
Abstract
Two sets of estimators of the center frequency and mean square bandwidth of a Doppler spectrum are analyzed. The first set is based on a linear combination of the complex autocorrelation of the Doppler signal for different lags. It is shown that the argument (phase angle) of the complex autocorrelation function at unit sample lag is a close approximation to the mean Doppler shift, whereas its modulus (magnitude) gives information about the mean square bandwidth of the spectrum. Approximate expressions for the bias and variance of the estimators are derived, valid for long averaging times. The performances of the estimators are compared for signals with rectangular spectra and different signal-to-noise ratios.<>Keywords
This publication has 13 references indexed in Scilit:
- A Comparison Between Mean Frequency Estimators for Multigated Doppler Systems with Serial Signal ProcessingIEEE Transactions on Biomedical Engineering, 1985
- A New Time Domain Technique for Velocity Measurements Using Doppler UltrasoundIEEE Transactions on Biomedical Engineering, 1985
- Real-Time Two-Dimensional Blood Flow Imaging Using an Autocorrelation TechniquePublished by Institute of Electrical and Electronics Engineers (IEEE) ,1985
- Discrete Time Estimation of the Mean Doppler Frequency in Ultrasonic Blood Velocity MeasurementsIEEE Transactions on Biomedical Engineering, 1983
- Instantaneous Frequency, Mean Frequency, and Variance of Mean Frequency Estimators for Ultrasonic Blood Velocity Doppler SignalsIEEE Transactions on Biomedical Engineering, 1981
- Power-spectrum centroid detection for doppler systems applicationsUltrasonic Imaging, 1980
- A Theoretical Study of the Scattering of Ultrasound from BloodIEEE Transactions on Biomedical Engineering, 1980
- In vivo comparison of electromagnetic and Doppler flowmeters: with special attention to the processing of the analogue Doppler flow signalCardiovascular Research, 1973
- On the instantaneous measurement of bloodflow by ultrasonic meansMedical & Biological Engineering & Computing, 1972