Apparatus for examining a moving object by means of ultrasound e

Details Apparatus for examining a moving object by means of ultrasound e Apparatus for examining a moving object by means of ultrasound e

1987-09-15

1989-08-01

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Echo systems

Speed determination

12866108, 73597, G01S 1558

Patent

active

048539040

ABSTRACT:
An apparatus for examining a moving object by means of ultrasound echography, enabling the measurement of the axial speed of said movement or the projection of the speed on the axis z of a beam of ultrasound excitations transmitted by an ultrasound transducer (10) with a repetition period T. The apparatus also comprises a transmission stage (20) and a stage (30) for receiving and processing the echographic signals returned to the transducer (10). The stage (30) for receiving and processing the echographic signals comprises a circuit (330) for estimating said axial speed V.sub.Iz (t) which comprises a circuit (340) for extracting the time shift .tau..sub.i (t) between two consecutive echoes e.sub.i (t) and e.sub.i+1 (t), constructed for solving the equation in .tau..sub.i (t): ##EQU1## where e.sub.i (t) is the derivative of the order "n" with respect to the time of the echo e.sub.i (t), and a circuit (350) for multiplication by C/2T so as to obtain V.sub.iz (t) on the basis of .tau..sub.i (t), where C is the propagation speed of the ultrasound wave.

REFERENCES:
patent: 3947805 (1976-03-01), Brown
patent: 4510587 (1985-04-01), Schneider
Dotti et al., Blood Flow Measurements by Ultrasound Correlation Techniques, Nov. 1976, pp. 571-575.
Bassini et al., In Vivo Recording of Blood Velocity Profiles in Studies in Virtro of Profile Alterations Induced by Known Stenosis, 1982, pp. 185-194.
Bassini et al., Ultrasonic Noninvasive Blood Flow Meter Based on Cross Correlation Techniques, 1979, pp. 273-278.

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