Blood flow images by a SAW-based multigate Doppler system

Multigate operation of an ultrasound pulsed Doppler flowmeter, providing Doppler frequency detection in a number of adjacent sample volumes, is capable of displaying the instantaneous blood velocity distribution along the cross section of a sonified vessel. Real-time serial Doppler processing of 32 range cells has been implemented in a novel system using fast spectral analysis based on surface-acoustic wave (SAW) dispersive filters. The basic architecture and first in vitro experiments were reported previously. The in vivo application of the system is described here, and images of human carotid artery and jugular vein are presented. Appropriate display formats are introduced to use the great amount of information known on spatial and temporal behavior of flow profiles. Digital postprocessing of spectral Doppler data allows velocity profiles to be displayed at selected times to correlate spatial and temporal evolution. A color code can be used to represent different velocity strengths. The potential application of the system to two-dimensional (2-D) flow imaging is discussed.<<ETX>>

[1]  D. Sirmans,et al.  Numerical Comparison of Five Mean Frequency Estimators , 1975 .

[2]  R W Barnes,et al.  Quantitative analysis of carotid artery Doppler spectral waveforms: diagnostic value of parameters. , 1983, Ultrasound in medicine & biology.

[3]  K. Kristoffersen,et al.  A Comparison Between Mean Frequency Estimators for Multigated Doppler Systems with Serial Signal Processing , 1985, IEEE Transactions on Biomedical Engineering.

[4]  Piero Tortoli,et al.  Chirp Fourier transform based on a single SAW filter , 1986 .

[5]  J. Woodcock,et al.  Doppler ultrasound and its use in clinical measurement , 1983 .

[6]  Bjorn A. J. Angelsen,et al.  On the Design of 2D Flow Imaging Systems , 1987 .

[7]  M.A. Jack,et al.  The theory, design, and applications of surface acoustic wave Fourier-transform processors , 1980, Proceedings of the IEEE.

[8]  R.S. Reneman,et al.  A Multigate Pulsed Doppler System with Serial Data Processing , 1981, IEEE Transactions on Sonics and Ultrasonics.

[9]  C. Atzeni,et al.  Velocity Profile Reconstruction Using Ultrafast Spectral Analysis of Doppler Ultrasound , 1985, IEEE Transactions on Sonics and Ultrasonics.

[10]  Max Anliker,et al.  Spatial Velocity Distributions in the Ascending Aorta of Healthy Humans and Cardiac Patients , 1986, IEEE Transactions on Biomedical Engineering.

[11]  M. Hennerici,et al.  Detection of early atherosclerotic lesions by duplex scanning of the carotid artery , 1984, Journal of clinical ultrasound : JCU.

[12]  Piero Tortoli,et al.  Pulse Doppler Flow Imaging Using a SAW CZT Processor , 1983 .

[13]  J. Reid,et al.  An infinite gate pulse Doppler. , 1981, Ultrasound in medicine & biology.

[14]  P. Embree,et al.  The Accurate Ultrasonic Measurement of the Volume Flow of Blood by Time Domain Correlation , 1985, IEEE 1985 Ultrasonics Symposium.

[15]  R S Reneman,et al.  Cardiovascular applications of multi-gate pulsed Doppler systems. , 1986, Ultrasound in medicine & biology.

[16]  M. Brandestini.  Topoflow - A digital full range Doppler velocity meter , 1978 .

[17]  Carlo Atzeni,et al.  Real Time Network Analysers Based on SAW Chirp Transform Processors , 1976 .

[18]  P N Wells,et al.  Doppler developments in the last quinquennium. , 1985, Ultrasound in medicine & biology.

[19]  C. Kasai,et al.  Real-Time Two-Dimensional Blood Flow Imaging Using an Autocorrelation Technique , 1985, IEEE 1985 Ultrasonics Symposium.

[20]  R S Reneman,et al.  Flow velocity patterns in and distensibility of the carotid artery bulb in subjects of various ages. , 1985, Circulation.

[21]  R. C. Waag,et al.  Spectral Analysis of Pulsed Ultrasound for Blood Flow Measurement in the Presence of Noise , 1978 .

[22]  J.B.G. Roberts,et al.  A processor for pulse-doppler radar , 1976, IEEE Transactions on Electron Devices.

[23]  N C Nanda,et al.  Doppler color flow mapping. , 1985, Ultrasound in medicine & biology.

[24]  Jeffrey W. Eberhard,et al.  A New Time Domain Technique for Velocity Measurements Using Doppler Ultrasound , 1985, IEEE Transactions on Biomedical Engineering.