Measuring and testing – Vibration – By mechanical waves
Patent
1984-11-02
1986-03-11
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
73602, 128660, G01N 2900
Patent
active
045746354
ABSTRACT:
A zero crossing detection circuit for estimating the ultrasonic attenuation in a region of interest in the body from an A-line signal which is representative of pulses of ultrasound energy reflected from said region. The ultrasound attenuation is estimated from the center frequency f.sub.Z of the returned energy which is calculated from the formula: ##EQU1## as measured at various depths in the body.
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patent: 4442713 (1984-04-01), Wilson
patent: 4475397 (1984-10-01), Riley
patent: 4509524 (1985-04-01), Miwa
patent: 4515163 (1985-05-01), Flax
patent: 4534221 (1985-08-01), Fife et al.
patent: 4534359 (1985-08-01), Miller-Jones
Birmiel Howard A.
Haken Jack E.
North American Philips Corporation
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