STUDY OF THE SPREAD OF TRANSVERSE ELASTIC WAVES IN BIOLOGICAL TISSUES

The method of excitation of transverse acoustic waves in biological tissues for the purpose of visualization of the subcutaneous structures of the peripheral vascular system is considered. The separation of longitudinal and transverse acoustic waves is carried out by measuring the speed of sound over the time of its propagation in the measuring and reference lines. A laboratory setup for the excitation of a transverse acoustic wave in biological tissues and a technique for measuring the characteristics of the propagation of transverse waves are described. The installation had two acoustic measuring and reference lines. A high-frequency pulse was simultaneously applied to the piezoelectric transducers of the measuring line and the reference line. The measurements were carried out first with no sample in the measuring line, then with a tissue sample. The readings of the micrometer screw, which determine the thickness of the reference liquid layer, were recorded. The velocity of the transverse wave in biological tissue was calculated according to the equality of the time gaps of the passage of acoustic waves through the sample of biological tissue and the layer of reference fluid. The results of measuring the speed of propagation of transverse waves in various biological tissues are given. Measuring the speed of propagation of transverse elastic waves in various samples of healthy and pathological tissues allows you to create a database of velocities of propagation of ultrasonic waves, which makes it possible to conduct an early and reliable diagnosis of pathologies.

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