Bi-directional continuous wave doppler flowmeter and its application in investigations of disturbed blood flows

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Authors

  • Maciej PIECHOCKI Institute of Fundamental Technological Research, Polish Academy of Sciences, Poland

Abstract

The paper deals with a new two-way Doppler apparatus and with its clinical applications. A mathematical description is given of operations leading to the separation of a signal in dependence of the flow direction. Also a block diagram of an analogue realization of such a system, and a diagram of a broad-band phase shifter, which is the principal part of the system, are presented. The part of the paper dealing with the applications shortly presents diagnostic methods and new clinical applications of flowmeters, in. which the system of separating flow directions plays a significant part.

References

[1] S. D. BEDROSIAN, Normalized Design of 90° Phase Difference Networlis, IRE Tran. Cir. Theory, CT-7, 128-136. (1960).

[2] P. M. BROWN, K. W. JOHNSTON, M. KOSSAN, R. S. C. COBBOLD, A Critical Study of Ultrasound Doppler Spectral Analysis for Detecting Carotid Disease, Ultrasound In. Med. Biol., 8, 5, 551-523 (1983).

[3] J. ETIENNE, A. NOWICKI, M. PIECHOCKI, W. SECOMSKI, A trial of visualizing the blood flow in the carotid artery with the application of a laboratory ultrasonic arterioscopy system, Proc. 5th Country Conf. Biocyb. Biomed. Eng., Warsaw 1981 (in Polish).

[4] J. ETIENNE, L. FILIPCZYŃSKI, A. NOWICKI, T. POWAŁOWSKI, M. PIECHOCKI, A. WLECIAŁ, M. BARAŃSKA, Ultrasonic arterioscope and its application in the diagnostics of carotid arteries, Proc. 6th Country Conf. Biocyb. Biomed. Eng., Warsaw 1983, Arch. Acoust., 9, 1-2 (1984).

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