Monitoring of frequency shift of ultrasound pulses in tissue

Details Monitoring of frequency shift of ultrasound pulses in tissue Monitoring of frequency shift of ultrasound pulses in tissue

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.

REFERENCES:
patent: 4016750 (1977-04-01), Green
patent: 4441368 (1984-04-01), Flax
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

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