title: ÐÐ¾Ð½ÑÑÐ¾Ð»Ñ Ð½Ð°Ð³ÑÐµÐ²Ð° Ð±Ð¸Ð¾Ð»Ð¾Ð³Ð¸ÑÐµÑÐºÐ¾Ð¹ ÑÐºÐ°Ð½Ð¸ Ñ Ð¿Ð¾Ð¼Ð¾ÑÑÑ ÑÐ»ÑÑÑÐ°Ð·Ð²ÑÐºÐ°
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Monitoring the biological tissue system using ultrasound
Creators: name: ÐÐ»Ð¸Ð¼Ð¾Ð²Ð°, ÐÐ»ÐµÐºÑÐ°Ð½Ð´ÑÐ°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: ÐÐ²ÑÐº
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description: The given work is devoted to the control of heating of biological tissue using ultrasound. A device for invasive multichannel temperature measurement in biological tissue with a time resolution of 2 ms has been developed. The process of ultrasonic heating of biological tissue samples and a gelatinous test object was studied at various intensities, duration of exposure and location of spots. One-dimensional and three-dimensional calculations of non-stationary temperature fields formed during processing have been carried out. In the course of the work, a number of effects influencing the measurement results were discovered and investigated. In particular, a systematic study of the heating of a thermocouple as a result of heat release in the boundary layer was carried out, and dependences on the intensity and duration of exposure were obtained. It turned out that in a wide range of exposure duration and intensity of ultrasound, heating of a thermocouple as a result of effects at its surface almost linearly depends on the amplitude of the sound wave, and not on its intensity. Good reproducibility of the effect makes it possible to use it for measuring ultrasound parameters and monitoring the performance of HIFU devices. A qualitative explanation of the observed effect is proposed. Direct measurements of the temperature in the vicinity of the ablation area confirmed the results of preliminary calculations, showing good localization of heat in the treatment area, and confirmed the safety of new treatment protocols based on the treatment of the affected tissue area by fast electronic movement of the focus of a multielement therapeutic emitter.