Geometrical Spectrum Broadening in Ultrasonic Doppler Systems
- 1 September 1977
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Biomedical Engineering
- Vol. BME-24 (5) , 478-480
- https://doi.org/10.1109/tbme.1977.326194
Abstract
The bandwidth of the output spectrum of blood flow meters may prove of value in estimating flow parameters such as the degree of turbulence. It is therefore important to determine the various factors which affect this bandwidth. It is shown that scatterers moving in the near field of the sound beam generated by a single transducer ultrasound Doppler system produce a spectrum whose breadth is primarily determined by the range of angles over which backscattered ultrasound is received by the transducer. An empirical method of calculating the bandwidth of the output spectrum is described, and the results are compared with direct Doppler measurements. Since the spectrum broadening depends on the angle between the target path and the ultrasound beam, it is suggested that the phenomenon may be usable to provide an independent measure of this angle.Keywords
This publication has 4 references indexed in Scilit:
- Analysis of Transit Time Effects on Doppler Flow MeasurementIEEE Transactions on Biomedical Engineering, 1976
- Diagnosis of Urethral Flow Parameters by Ultrasonic BackscatterIEEE Transactions on Biomedical Engineering, 1975
- On the instantaneous measurement of bloodflow by ultrasonic meansMedical & Biological Engineering & Computing, 1972
- Spectral Broadening of Acoustic Reverberation in Doppler-Shift Fluid FlowmetersThe Journal of the Acoustical Society of America, 1964