ULTRASONIC CHARACTERISATION APPARATUS FOR LIVING TISSUE

摘要

Damping of ultrasound projected to the soft tissure related to the liver disease, is measured by entropy between envelope curves of ultrasonic pulse echo. A numerical formular is formulated by statistical characteristics of sampling data, after an envelope curve is detected from ultrasonic signals received in a time domain. The damping coefficient of the diseased tissue, is calculated by modulation of the damping coefficient in order to equalize the entropy values between two divisions.