Method and means for determining ultrasonic wave attenuation in

Details Method and means for determining ultrasonic wave attenuation in Method and means for determining ultrasonic wave attenuation in

1983-08-08

1985-10-15

Howell, Kyle L.

Surgery

Truss

Pad

73599, A61B 1000

Patent

active

045467722

ABSTRACT:
The frequency of a reflected ultrasonic wave decreases in frequency as the wave is attenuated in passing through tissue. A measure of attenuation is obtained by applying an electrical signal generated from the ultrasonic wave to a phase detector along with a signal from a voltage controlled oscillator and controlling the voltage controlled oscillator with the output of the phase detector. By measuring the voltage applied to control the oscillator, an estimation of the mean frequency (first moment) of the power spectrum is obtained. This frequency estimator can, in turn, be used to estimate the attenuation of the ultrasonic wave as it propagates through the media by noting the shift in frequency with propagation depth.

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Pan, K. M. et al., "Tomographic Reconstruction of Ultrasonic Attenuation with Correction for Refractive Errors", IBM Jrnl. Res. & Devel., Jan. 1981, pp. 71-82.
Kac, R. et al., "Estimating the Acoustic Attenuation Coeff. Slope for Liver from Reflected UTS Signals," IEEE Trans. Sonics & Ultrasonics, vol. SU-26 #5, Sep. 1979, pp. 353-362.
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Stagg, J. et al., "Electronic Analysis of Fetal Breathing Movements: A Practial Application of PLL Principles", Jrnl. of Med. Eng. & Tech., vol. 2, #5, Sep. 1978, pp. 246-249.
Dines, K. A. et al., "UTS Attenuation Tomography of Soft Tissues", UTS Imaging, vol. 1, #1, 1979, pp. 16-33.

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