Experimental Study of the Focused Ultrasonic System for Differential Diagnostics of the Human Hearing

Main Article Content

Dariia Oleksandrivna Liashko
https://orcid.org/0000-0001-9816-8992
Dr.Sc.(Eng.) Prof. Serhii Anatoliiovych Naida
https://orcid.org/0000-0002-5060-2929

Abstract

In this paper the analysis of relevance and novelty of application of piezoelectric transducer for noninvasive diagnostics of a cochlea of the human by means of the focused ultrasound is carried out. To date, clinical use of ultrasound is numerous and diverse, and ultrasound diagnosis is one of the fastest growing methods in medicine. Revealed a previously unknown effect of spatial notch filtering quarter wavelength layers diffuse heat radiation. It is shown that the effect, together with a focused acoustic thermometer, allows for greater accuracy and allows measurement of the body's deep body temperature in real time.

The design of the converter consists of a piezoceramic, an acoustic lens with the help of which the transformation of a flat wave front into an acoustic system with a flat piezoelement. The flat, concave lens is made of solid material, the rate of ultrasonic diffusion in which exceeds its value in water (biological tissue) for the studied acoustic system, organic glass was chosen. It is provided the theory, calculation and a design of measuring means: a high-frequency wattmeter for measurement of the electric power consumed by a piezoelectric transducer; the radiometer for measurement of acoustic power of the focused ultrasonic bunches. With their help detailed pilot study of the acoustic system is conducted, namely, parameters of her acoustic field and efficiency are determined. The theory, calculation and design are given: free float radiometer for measuring acoustic power of both focused and unfocused ultrashort beams; high-frequency wattmeter without active elements for measuring the power consumption of a piezus emitter.

The experimental study of the layout of the acoustic focusing system is to measure the emitted acoustic and consumed electrical power of the piezoelectric element with the lens. The task of measuring acoustic power is solved using a radiometer. The measurement of the consumed electric power is made by means of a high-frequency wattmeter, which contains a multiplication scheme in the form of a circular scheme on four diodes and a current transformer. The received frequency dependences of radiated acoustic power, electric power consumed and the efficiency factor are obtained.

The conclusion about expediency of use of this type of the electro-acoustic transducer for differential diagnostics of hearing of the human is drawn. The calculated intensity is sufficient for both diagnostic and therapeutic use of the developed acoustic system. This type of piezoelectric transducer will make it possible to distinguish between diseases of the middle ear of a person from internal diseases, and therefore to carry out differential diagnostics of the auditory system. This is especially important in clinical practice for choosing a further recovery strategy: if the loss occurs in the middle ear - the hearing aid is used, if in the inner one - is performed surgically by implantation of the cochlear implant.

Ref. 10, fig. 6, tabl. 2.

Article Details

How to Cite
[1]
D. O. Liashko and S. A. Naida, “Experimental Study of the Focused Ultrasonic System for Differential Diagnostics of the Human Hearing”, Мікросист., Електрон. та Акуст., vol. 23, no. 3, pp. 58–64, Jun. 2018.
Section
Acoustical devices and systems
Author Biographies

Dariia Oleksandrivna Liashko, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”

Кафедра акустики та акустоелектроніки, аспірантка

Dr.Sc.(Eng.) Prof. Serhii Anatoliiovych Naida, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”

Doctor of Technical Sciences, Professor Sergey Naida. Sergey Naida is a KPI graduate –in 1992 he graduated electro acoustical Faculty of KPI. After three years he successfully passed postgraduate studies at the Department of Acoustic and Acoustoelectronics. In May 1996 Sergey Naida defended his candidate these, in November 2010 doctor’s dissertation by the specialty “Applied Acoustics and Sound Technics”. During this time he worked his way from the assistant to the associated Professor and then Professor of the Acoustics and Acoustoelectronics Department.

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