Ultrasonic Doppler flow meter

Details Ultrasonic Doppler flow meter Ultrasonic Doppler flow meter

1990-11-06

1992-05-12

Jaworski, Francis

Surgery

Truss

Pad

7386125, A61B 802

Patent

active

051118254

ABSTRACT:
A flow meter for detecting a flow speed in such a manner that an ultrasonic pulsed continuous wave is repeatedly transmitted toward an object at predetermined intervals T, a phase vector indicative of the phase of a reception signal due to the reflected wave is produced at the predetermined intervals, the phase difference between the present phase vector and the preceding phase vector is detected, and a Doppler frequency is calculated from the average value of a plurality of phase difference values to obtain the speed of the object. The phase difference values are classified into a first group consisting of position phase difference values and a second group consisting of negative phase difference values, the cosine and sine values of the central angle of the positive phase difference values and the cosine and sine values of the central angle of the negative phase difference values are calculated, and the argument of a vector indicated by the weighted sum of cosine values and the weighted sum of sine values is calculated to be used as an average phase angle.

REFERENCES:
patent: 4809703 (1989-03-01), Ishikawa et al.
patent: 4905206 (1990-02-01), Nishiyama et al.
patent: 4955386 (1990-09-01), Nishiyama et al.
patent: 4961427 (1990-10-01), Namekawa et al.
patent: 4979513 (1990-12-01), Sakai et al.
patent: 4993417 (1991-02-01), Seo
"Pulsed Ultrasonic Doppler Blood Flow Sensing," IEEE trans. SU-17, No. 3, pp. 170-185, 1970.
1978 Ultrasonic Symposium Proceedings, pp. 348-352.
"Real-Time Two Dimensional Blood Flow Imaging Using an Autocorrelation Technique," IEEE Trans. SU-32, No. 3 pp. 458-464, 1985.

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