Method of and device for scanning objects by ultrasound echograp

Details Method of and device for scanning objects by ultrasound echograp Method of and device for scanning objects by ultrasound echograp

1984-10-11

1986-06-17

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73602, 73620, 73629, G01N 2900

Patent

active

045948968

ABSTRACT:
A method for the scanning of non-linearly dispersive objects whereby changes of the energy spectrum of echographic signals can be quantitatively related to parameters of the objects examined, that is to say the ultrasonic attenuation factor .beta. and the exponent r which characterizes the relationship between the non-linear variation of the attenuation and the frequency. To this end, the signals received are split into a number of (n) substantially equally wide, consecutive frequency bands which together cover approximately all frequencies of the signals received. The envelope of the signals in each frequency band is determined and each of the envelopes is multiplied by a correction signal in order to compensate for the diffraction effect. The logarithm of the envelopes thus corrected is determined, after which the following operations are performed by means of the n signals thus obtained:

REFERENCES:
patent: 4445379 (1984-05-01), Yamaguchi et al.
patent: 4470303 (1984-09-01), O'Donnell
patent: 4472972 (1984-09-01), Riley

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