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Abstract

This invention relates to a reflection type ultrasonic living body tissue characterization method obtaining highly accurate measuring result. The reflected ultrasonic wave power from the tissue to be measured is measured for respective frequency ranges. Then, it is normalized by the result of measuring the reflected ultrasonic wave power using a standard reflector placed in the equivalent region in non-attenuative medium to measure the tissue transfer function. Thereby, the characteristic of the measuring system can be eliminated. Moreover, unknown values not dependent on frequency are eliminated by normalizing the values measured at other frequencies with the value measured at a particular frequency. In addition, the corresponding transfer function of the tissue model is described with a product of an exponential function. Dividing the measured tissue transfer function with the non-exponential function and taking the logarithm makes the regression calculation of the measured function to the model function easier. Thereafter, various parameters indicating the tissue characteristic are obtained by regression calculations.

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First Claim