A New Aliasing Extension Method for Ultrasonic 2-Dimensional Pulsed Doppler Systems

The mean frequency aliasing problem originating from the pulse repetition frequency is one of major limitations in ultrasound pulsed Doppler systems. A conventional approach to resolving this problem is to track the mean frequencies close to and beyond the Nyquist frequency along the temporal axis. In this paper, a new concept of tracking the mean frequencies along the spatial axis is proposed for the same problem. The technique is fault tolerable and more suitable for multigate and 2-D Doppler systems than conventional methods. Simulation and experimental results show that the proposed system has improved performance compared with that of the conventional systems.

[1]  D. Baker.  Pulsed Ultrasonic Doppler Blood-Flow Sensing , 1970, IEEE Transactions on Sonics and Ultrasonics.

[2]  V. Newhouse,et al.  Ultrasonic random‐signal flow measurement system , 1974 .

[3]  L. Huntsman,et al.  Trancutaneous determination of aortic blood-flow velocities in man. , 1975, American heart journal.

[4]  Dusan S. Zrnic,et al.  Considerations for Pulse-Doppler Radar Observations of Severe Thunderstorms , 1978 .

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

[6]  Dominique J. Cathignol,et al.  Transcutaneous Blood Flow Measurements Using Pseudorandom Noise Doppler System , 1980, IEEE Transactions on Biomedical Engineering.

[7]  C. Hartley,et al.  Resolution of Frequency Aliases in Ultrasonic Pulsed Doppler Velocimeters , 1981, IEEE Transactions on Sonics and Ultrasonics.

[8]  B. Angelsen.  Instantaneous Frequency, Mean Frequency, and Variance of Mean Frequency Estimators for Ultrasonic Blood Velocity Doppler Signals , 1981, IEEE Transactions on Biomedical Engineering.

[9]  A C Kak,et al.  An analytical study of Doppler ultrasound systems. , 1985, Ultrasonic imaging.

[10]  Mani Azimi,et al.  An Analytical Study of Doppler Ultrasound Systems1 , 1985 .

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

[12]  R. Reneman,et al.  Simulation of real-time frequency estimators for pulsed Doppler systems. , 1986, Ultrasonic imaging (Print).

[13]  A.P.G. Hoeks,et al.  Simulation of Real-Time Frequency Estimators for Pulsed Doppler Systems , 1986 .