Archives of Acoustics, 35, 4, pp. 653–660, 2010

Annular Array Transducer and Matched Amplifier for Therapeutic Ultrasound

Wojciech SECOMSKI
Institute of Fundamental Technological Research Polish Academy of Sciences

Andrzej NOWICKI
Institute of Fundamental Technological Research Polish Academy of Sciences

Janusz WÓJCIK
Institute of Fundamental Technological Research Polish Academy of Sciences

Marcin LEWANDOWSKI
Institute of Fundamental Technological Research Polish Academy of Sciences

Mateusz WALCZAK
Institute of Fundamental Technological Research Polish Academy of Sciences

Ryszard TYMKIEWICZ
Institute of Fundamental Technological Research Polish Academy of Sciences

The use of therapeutic ultrasound continues to grow. A focused ultrasonic wave can increase the tissue temperature locally for the non-invasive cancer treatment or other medical applications. The authors have designed a seven-element annular array transducer operating at 2.4 MHz. Each element was excited by sine burst supplied by a linear amplifier and FPGA control circuits. The acoustic field, generated by a transducer was initially numerically simulated in a computer and next compared to water tank hydrophone measurements performed at 20, 40 and 60 mm focal depth. The results showed good agreement of the measurements with theory and the possibility to focus the ultrasound in the preselected area. The total acoustic power radiated by the annular array was equal to 2.4 W.
Keywords: ultrasonic therapy; annular array transducer; ultrasonic field
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