Ultrasonic imaging method and apparatus

Details Ultrasonic imaging method and apparatus Ultrasonic imaging method and apparatus

1975-11-06

1977-04-12

Queisser, Richard C.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

128 2V, G01N 2900

Patent

active

040167500

ABSTRACT:
The ultrasonic imaging method and apparatus comprises an ultrasonic wave transducer supplied with recurrent multifrequency energy pulses for pulse insonification of an object under investigation with ultrasonic waves. Resultant echo waves from the object are directed onto the transducer for converting the same to electrical signals which are supplied to a signal processor which includes a variable bandpass filter. One or more of the filter characteristics are varied as a function of depth from which the echo signals are returned for enhanced resolution and signal-to-noise ratio of the received signal. Preferably, the filter is matched to the noise and signal spectra of the system. For A scan and B scan operations wherein reverberated acoustic pulses are derived from a range of depths a time variable filter is employed for time varying operation thereof.

REFERENCES:
patent: 3033029 (1962-05-01), Weighart
patent: 3276249 (1966-10-01), King
patent: 3307408 (1967-03-01), Thomas et al.
patent: 3367173 (1968-02-01), Uphoff
patent: 3453871 (1969-07-01), Krautkramer

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