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Proceedings Paper

High-frequency ultrasound miniature transducers for tissue imaging
Author(s): Koichi Yokosawa; Yukio Ito; Syuzo Sano; Ryuichi Shinomura; Yutaka Sato
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Paper Abstract

We have fabricated a miniature 120-MHz transducer for imaging the internal structure of living samples, and mounted it in a 3-mm-diameter rod-shaped probe which ensures contact with a tissue to evaluate the tissue imaging capability of the transducer. The transducer consists of a thin film of 12.5-micrometer thick ZnO sandwiched between two metal electrodes, the bottom one deposited on a sapphire substrate whose other face has a polished concave-sphere acoustic lens. Both the lens diameter and the sphere radius are 0.5 mm; that is, the F number of the lens is 1. The lens of the transducer faces outwards in the probe so that the ultrasound can be transmitted and received directly by it in the radial direction of the rod without any mirrors. As the probe rotates mechanically around its axis and shifts in the direction of the axis, a cylindrical plane created by the locus of the beam focus is located inside of the tissue. Using this scanning, we form tissue images in the C-scan mode in a cylindrical plane within the target tissue. Preliminary results for imaging an in vitro bovine kidney sample into which the probe was inserted demonstrate that the fabricated probe can image microscopic structure inside tissue samples.

Paper Details

Date Published: 10 April 1997
PDF: 9 pages
Proc. SPIE 3037, Medical Imaging 1997: Ultrasonic Transducer Engineering, (10 April 1997); doi: 10.1117/12.271323
Show Author Affiliations
Koichi Yokosawa, Hitachi, Ltd. (Japan)
Yukio Ito, Hitachi Medical Corp. (Japan)
Syuzo Sano, Hitachi Medical Corp. (Japan)
Ryuichi Shinomura, Hitachi, Ltd. (Japan)
Yutaka Sato, Hitachi Medical Corp. (Japan)

Published in SPIE Proceedings Vol. 3037:
Medical Imaging 1997: Ultrasonic Transducer Engineering
K. Kirk Shung, Editor(s)

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