Method and means for determining frequency selective tissue atte

Details Method and means for determining frequency selective tissue atte Method and means for determining frequency selective tissue atte

1982-12-02

1985-08-13

Howell, Kyle L.

Surgery

Truss

Pad

73599, 73626, A61B 1000

Patent

active

045343594

ABSTRACT:
Ultrasonic wave attenuation in passing through tissue is determined from frequency changes in reflected ultrasonic waves passing through the tissue. In a baseband ultrasonic imaging system in which transducer generated signals are coherently detected by mixing the signals with a fixed frequency signal both in phase and in phase quadrature, a measure of frequency change in the reflected ultrasonic signal is obtained by measuring phase shift in a side band of the mixed signals.

REFERENCES:
patent: 3068407 (1962-12-01), Altman
patent: 3076963 (1963-02-01), Byatt
patent: 3078415 (1963-02-01), Frelich
patent: 3509475 (1970-04-01), Webb
patent: 3900879 (1975-08-01), LeWinter

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