Measuring and testing – Vibration – By mechanical waves
Patent
1986-12-03
1989-03-21
Levy, Stewart J.
Measuring and testing
Vibration
By mechanical waves
G01N 2900
Patent
active
048132799
ABSTRACT:
An ultrasonic imaging apparatus is constituted by an ultrasonic transducer for scanning an object to be examined with an ultrasonic beam in a plurality of scan directions and converting echo waves from the object into echo signals, a transmitter for driving the ultrasonic transducer twice, so as to cause the ultrasonic transducer to emit the ultrasonic beam twice in each scan direction, a delay circuit for causing the echo signals to be subjected to signal-processing by different delay amounts to alternately form odd- and even-numbered receiving focus regions in the scan direction upon two transmission operations of the ultrasonic beam and for outputting echo signal components corresponding to the odd- and even-numbered receiving focus regions, and a mixing circuit for mixing the echo signal components corresponding to the odd- and even-numbered receiving focus regions to form video data for one scan line. The video data obtained from the mixing circuit is displayed on a monitor as an ultrasonic tomographic image.
REFERENCES:
patent: 4319489 (1982-03-01), Yamaguchi et al.
patent: 4392379 (1983-07-01), Yamaguchi
patent: 4541435 (1985-09-01), Saito et al.
patent: 4649927 (1987-03-01), Fehr et al.
patent: 4665924 (1987-05-01), Saito et al.
Bell Robert P.
Kabushiki Kaisha Toshiba
Levy Stewart J.
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