Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1979-08-24
1981-03-24
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
128663, G01F 166
Patent
active
042572789
ABSTRACT:
A technique particularly suitable for measuring volume flow rate in the ascending aorta employs real time sector-scan imaging to locate the cross section of interest and align the Doppler beam with the vessel axis. The number of active transmit and receive array transducer elements is varied to electronically tailor the acoustic beam cross section at the required range to be approximately equal to the vessel cross section, which is the sample volume. Mean flow velocity is computed by averaging the spectral components extracted from the sample volume by a Fourier transform processor. Volume flow rate is calculated by multiplying mean flow velocity and estimated area.
REFERENCES:
patent: 3939707 (1976-02-01), Kossoff
patent: 4062237 (1977-12-01), Fox
patent: 4159462 (1979-06-01), Rocha et al.
patent: 4182173 (1980-01-01), Papadofrangakis et al.
patent: 4217909 (1980-08-01), Papadofrangakis et al.
C. F. Hottinger et al., "Unambiguous Measurement of Volume Flow Using Ultrasound", Proceeding of the IEEE, Jun. 1975.
Fakiris John A.
Papadofrangakis Emmanuel
Campbell Donald R.
Davis James C.
General Electric Company
Ruehl Charles A.
Snyder Marvin
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