High-frequency transducer arrays for medical imaging

Timothy A. Ritter; K. Kirk Shung; Richard L. Tutwiler; Thomas R. Shrout

doi:10.1117/12.382227

12 April 2000 High-frequency transducer arrays for medical imaging

Timothy A. Ritter, K. Kirk Shung, Richard L. Tutwiler, Thomas R. Shrout

Proceedings Volume 3982, Medical Imaging 2000: Ultrasonic Imaging and Signal Processing; (2000) https://doi.org/10.1117/12.382227
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

This paper discusses the design, fabrication, testing, and simulated imaging performance of high frequency linear arrays. Both a 2 - 2 PZT composite array with a fine spatial scale and a PbTiO₃ array have been investigated at 30 MHz. The composite array demonstrated a seven-fold increase in sensitivity over the PbTiO₃ array, as well as increased bandwidth and reduced crosstalk. The electrical impedance magnitude of the composite array was 56 ohms at 30 MHz, and the measured insertion loss was -14 dB. Simulated results demonstrate excellent lateral and axial resolution when imaging a phantom using a synthetic aperture approach. A 35 MHz device is also under development. An interconnect method using a flex circuit and sputtered metal films is used to electrically connect to each element. A curve fitting technique was then used to characterize elements of the array. Electromechanical coupling coefficients from 0.55 to 0.62 and clamped relative permittivities ((epsilon) ₃₃^S,/(epsilon) ₀) from 1200 to 2000 were observed.

Citation Download Citation

Timothy A. Ritter, K. Kirk Shung, Richard L. Tutwiler, and Thomas R. Shrout "High-frequency transducer arrays for medical imaging", Proc. SPIE 3982, Medical Imaging 2000: Ultrasonic Imaging and Signal Processing, (12 April 2000); https://doi.org/10.1117/12.382227

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