Measuring apparatus utilizing spectrum profile
First Claim
1. An apparatus utilizing the profile of a travelled power spectrum of a received signal wave of pulses transmitted through or reflected in an object, corresponding to an originally incident pulse having a predetermined power spectrum, to measure the characteristics of said object, said apparatus comprising:
- processing means for reducing the scalloping of the travelled power spectrum of said received signal wave;
recovery means for deriving the travelled power spectrum with the reduced scalloping; and
extracting means for extracting information on the characteristics of said object from the derived power spectrum.
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Abstract
This invention relates to an apparatus for measuring of imaging the characteristic structure of a medium utilizing the power spectrum profile of received signal waves, which are derived from an incident beam pulse of ultrasonic waves or other waves that are incident on the object to be measured and which travel through the object by transmission and reflection. They are affected by various acoustic characteristic structures of the object, and information about the structure can be attained by the procession of the signals received with a transducer. The processing is performed by taking their cepstrum, and filtering the slowly varying cepstra including that of the target Gaussian shaped pulse signal from the fast varying cepstra. The filtered cepstrum is processed further by the inverse transformations to the power spectrum derived from said filtered cepstrum. The influence of line cepstra remaining still in the lower frequency and the frequency dependence of the reflection indices of the structure to the derived power spectrum is eliminated by the distortion indices of said derived power spectrum. Thus the travelled power spectrum is recovered as a virtual spectrum, expected when such influences do not exist. Tissue characteristics are extracted from the recovered spectrum. The distortion indices are represented by various order moments of the derived power spectrum.
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Citations
14 Claims
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1. An apparatus utilizing the profile of a travelled power spectrum of a received signal wave of pulses transmitted through or reflected in an object, corresponding to an originally incident pulse having a predetermined power spectrum, to measure the characteristics of said object, said apparatus comprising:
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processing means for reducing the scalloping of the travelled power spectrum of said received signal wave; recovery means for deriving the travelled power spectrum with the reduced scalloping; and extracting means for extracting information on the characteristics of said object from the derived power spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification