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Structure and performances of mono- and bidimensional pulsed Doppler systems

  • P. Peronneau
  • B. Diebold
  • J. P. Guglielmi
  • O. Lanusel
  • R. Bele
  • J. Souquet
Part of the Developments in Cardiovascular Medicine book series (DICM, volume 54)

Abstract

Pulsatility of cardiac events limits the time allowed for acquiring informations. Biological tissue, ultrasonic probe and electronical circuits produce noise which is added to the signal. The theoretical accuracy of any velocity measurement can be expressed using the Woodward’s relation: sv = k/(Tm × R1/2), where sv is the variance of the velocity estimation, R the signal-to-noise ratio and Tm the measurement duration. Technical problems are further complicated by the presence of wall motion producing strong low frequency Doppler signals.

In pulsed Doppler systems, transmitted bursts generate backscattered echos. Each of them is processed in order to get I and Q signals, thus defining a point. Successive bursts produce successive points, the rotation of them defining the velocity and the orientation of the target motion.

For a given depth, when a single line is studied, the number of bursts corresponding to the pulse repetition rate is used both for filtering and velocity estimation. At the opposite, when considering 2D Doppler imaging, the same number of bursts is shared between the lines required for building the image. Therefore, the number of informations available for filtering and velocity estimation is far smaller, leading to a poor accuracy.

Keywords

Wall Motion Pulse Repetition Rate Doppler Frequency Doppler Signal Velocity Estimation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Woodward PM: Probability and information theory with application to radar. London: Pergamon Press, 1953.Google Scholar
  2. 2.
    Miller KS, Rochwarger MM: A covariance approach to spectral moment estimation. IEEE Trans. Inform. Theory, IT-18: 588–596, 1972.Google Scholar
  3. 3.
    Namekawa K, Kasai C, Tsukamoto M, Koyano A: Realtime bloodflow imaging utilizing autocorrelation techniques. In: Lerski RA, Morley P (eds) Ultrasound’82, pp. 203–208. Oxford: Pergamon Press, 1983.Google Scholar
  4. 4.
    Peronneau P, Bournat J-P, Bugnon A, Barbet A, Xhaard M: Theoretical and practical aspects of pulsed Doppler flowmetry: real-time application to the measure of instantaneous velocity profiles in vitro and in vivo. In: Reneman RS (ed) Cardiovascular applications of ultrasound, pp. 866–84. Amsterdam: North Holland Publishing Co., 1974.Google Scholar
  5. 5.
    McLeod FD: Multichannel pulse Doppler techniques. In: Reneman RS (ed), Cardiovascular applications of ultrasound pp. 85–107. Amsterdam: North Holland Publishing Company, 1974.Google Scholar
  6. 6.
    Hoeks AP, Reneman RS, Peronneau P: A multigate pulsed Doppler system with serial data processing. IEEE Transactions Sonics Ultrason., SU-28: 242–247, 1981.Google Scholar
  7. 7.
    Grandchamp PA: A novel pulsed directional Doppler velocimeter: the phase detection pro- filometer. In: Kazner E. et al. (eds) Proceedings of the Second European Congress on Ultrasonics in Medicine, pp. 123–132. Amsterdam: Excerpta Medica, 1975.Google Scholar
  8. 8.
    Brandestini M: Topoflow — A digital full range Doppler velocity meter. IEEE Transactions Sonics Ultrason., SU-25: 287–293, 1978.Google Scholar
  9. 9.
    Nowicki A, Reid JR. Dynamic ultasonic visualization of blood vessels and flows. Archives of Acoustics 7: 225–246, 1982.Google Scholar
  10. 10.
    Cathignol D, Fourcade C, Chapelon J-Y: Transcutaneous blood flow measurement using pseudo-random noise Doppler velocimeter. IEEE Transactions Biomed. Engg. 27: 30–36, 1980.CrossRefGoogle Scholar
  11. 11.
    Yoshikawa Y, Koyano A: Performance of the system. In: Omoto R (ed) Real time two- dimensional Doppler echocardiography. Tokyo Shindan-to-Chiryo, 1984.Google Scholar

Copyright information

© Martinus Nijhoff Publishers, Dordrecht 1986

Authors and Affiliations

  • P. Peronneau
  • B. Diebold
  • J. P. Guglielmi
  • O. Lanusel
  • R. Bele
  • J. Souquet

There are no affiliations available

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