Measuring and testing – Vibration – By mechanical waves
Patent
1986-10-03
1988-06-21
Levy, Stewart J.
Measuring and testing
Vibration
By mechanical waves
358112, 364724, G01N 2900, H04N 5213
Patent
active
047518464
ABSTRACT:
Techniques are disclosed for producing improved ultrasonic cross-sectional images of a body subject to a number of consecutive and at least partly overlapping scans by the pulse echo method to produce digital image signals corresponding to the received echoes. The illustrated systems includes an ultrasonic transducer scanner energized by a transmitter, and a receiver configuration which processes the received echo signals for display on a TV monitor. To reduce the image-quality-limiting noise while retaining a satisfactory representation of moving parts in the zone under examination, image signals corresponding to corresponding scanning dots of consecutive scans are combined in the receiver circuit which utilizes time-discrete non-linear filtering with filter coefficients which vary as a function of the filter input signal. This arrangement and the related process produce improved images.
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Fess Lawrence G.
Johnston George W.
Kontron Holding A.G.
Leon Bernard S.
Levy Stewart J.
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