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The Estimate Rate of Permanent Flow of a Liquid Simulating Blood by Doppler Effect

Authors: Malika.D Kedir-Talha, Mohammed Mehenni


To improve the characterization of blood flows, we propose a method which makes it possible to use the spectral analysis of the Doppler signals. Our calculation induces a reasonable approximation, the error made on estimated speed reflects the fact that speed depends on the flow conditions as well as on measurement parameters like the bore and the volume flow rate. The estimate of the Doppler signal frequency enables us to determine the maximum Doppler frequencie Fd max as well as the maximum flow speed. The results show that the difference between the estimated frequencies ( Fde ) and the Doppler frequencies ( Fd ) is small, this variation tends to zero for important θ angles and it is proportional to the diameter D. The description of the speed of friction and the coefficient of friction justify the error rate obtained.

Keywords: Doppler frequency, Doppler spectrum, estimate speed, permanent flow.

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[1] S.A.Johns "Fundamental sources of error and spectral broadening in Doppler ultrasound signals" Crist -Rev-Biomed-Eng. , 1993, Vol. 21-n┬░5, p.399-483.
[2] P.A.J Bascon, K.W. Johnston-R.S.C Cobbold and M. Ojha, Defining the limitations of measurements from Doppler spectral recordings. J.Vax- Surg. 1996, 24, p. 34-45.
[3] D.H.Evans W.N Mc Dicken, R. Skidmore and J.P Wood-code. Doppler Ultrasound: Physics, Instrumentation and Clinical Applications, Chi aster -U.K John Wiley & Sons-1989.
[4] D.W. Rickey, P.A. Picot, D.A. Christopher and A. Fenster, A well-less vessel phantom for Doppler ultrasound studies-Ultrasound Med-Biol. 1995-21 (9), p. 1163-1176.
[5] K.V. Ramnarine, D.K. Nassiri, P.R. Haskins and J. Lubbers, Validation of a new blood-mimicking fluid for use in Doppler flow test objects-Ultrasound Med-Biol.-1998, 24 (3), p. 451-459.
[6] P.J. Fish- « Doppler methods in physical principals of medical ultrasonic. » C.R-Hill-Ed-Chi aster -U.K :Ellis Horwood 1986, ch. 11, p. 338-376.
[7] H. Schlichting, « Boundary layer-theory » Mc. Graw Hill bookcompany. 1979, ch. 20, p. 57-602.
[8] A.H.Sleinman, J.G Myers, R.S.C Cobbold « A new approch for determinating maximum frequency in clinical Doppler ultrasound spectral estimates » Proceeding of the 22 Annual EMBS International conférence Chicago 2000, pp-2640-2643.
[9] North American Symptomatic Carotid Endarterectomy Trial (NASCET) Collaborator. Beneficial effect of carotid endarterectomy in symptomatic patients with high grade carotid stenosis, N. Engl. J. Med. 1991, 325 (7), p. 445-453.
[10] European Carotid Surgery Trialists (ESCST) Collaborative Group. MRC European Carotid Surgery Trial: Interim results for symptomatic patients with severs (70-99%) or with mild -0-29%) carotid stenosis. Lourcet. 1991, 337, p. 1235-1243.