FOCUSING ULTRASONIC ENERGY IN A SPECIFIED AREA OF A BIOLOGICAL OBJECT WITH CONSIDERING THE INTERFACE BETWEEN THE TWO MEDIA
V. P. Yushchenko1, V. G. Edvabnik1, O. V. Gofman2, T. V. Duluba3, V. N. Legkiy1
1Novosibirsk State Technical University, Novosibirsk, Russia
2Confadecor LLC, Smolensk, Russia
3Saint-Gobain LLC, Moscow, Russia
Keywords: annular antenna array, ultrasound, focusing, monochromatic probing signal
Abstract
A method of focused delivery of ultrasonic energy to a specified point inside a biological object using an annular antenna array is presented. A functional diagram of a multi-element annular array with alternating radiating and receiving elements is described. The channels of the radiating elements have controlled phase shifters, and all the receiving elements are connected to the adder. The possibility of focusing the ultrasonic energy with allowance for the wave propagation in two media is demonstrated by means of simulations of the annular antenna array operation. The result of focusing with considering the interface between the two media is estimated. It is assumed that the two media have different speeds of ultrasonic wave propagation. The presence of two media on the ultrasonic wave path leads to defocusing and shifting of the focus position.
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