FIELD: measuring.
SUBSTANCE: invention relates to measurement equipment, namely to measurements of temperature rise in the volume of a test object imitating soft tissues of the human body, when it is sonicated with ultrasound with frequency of 0.8-3.0 MHz. Such measurements are necessary to assess the patient’s safety during treatment by ultrasonic physiotherapy with the help of special apparatuses with the application of an ultrasonic transducer (therapeutic head) to the body surface, which generates ultrasonic vibrations that penetrate into the patient’s body at different depths (depending on the radiation frequency) and cause it heating, degree of which depends on absorbing properties of tissue, frequency, intensity of ultrasonic exposure and its duration. Permissible therapeutic effect caused by heating is limited from above by temperature increase to 43 °C, established by standards for safe use of ultrasonic therapy apparatuses. Tissue heating occurs under the influence of two mechanisms: as a result of contact heat transfer from the therapeutic head, which is heated due to inefficient conversion of electric energy of its excitation into mechanical energy of ultrasonic vibrations, and as a result of ultrasound absorption by the tissue itself along the entire depth of ultrasound penetration into the patient's body.
EFFECT: providing the possibility of measuring tissue temperature throughout its sound volume, which makes it possible to find the location of the most "hot" point (with maximum intensity of the ultrasonic field) inside the tissue volume, as well as providing the possibility of obtaining an estimate of the spatial configuration of the ultrasonic beam.
2 cl, 1 dwg
