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Proceedings Paper

Pad-printed thick-film transducers for high-frequency and high-power applications
Author(s): Wanda W. Wolny; Jeffrey A. Ketterling; Franck Levassort; Rasmus Lou-Moeller; Erwan Filoux; Jonathan Mamou; Ronald H. Silverman; Marc Lethiecq
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Paper Abstract

High-frequency-ultrasound transducers are widely used but are typically based either on planar piezoceramic sections that are lapped down to smaller thicknesses or on piezopolymers that may be deformed into more complex geometries. Piezoceramics then require dicing to obtain arrays or can be fractured into spherical geometries to achieve focusing. Piezopolymers are not as efficient for very small element sizes and are normally available only in discrete thicknesses. Thick-film (TF) transducers provide a means of overcoming these limits because the piezoelectric film is deposited with the required thickness, size and geometry, thus avoiding any subsequent machining. Thick-film transducers offer the potential of a wide range of geometries such as single-elements and annular or linear arrays. Here, a single-element focused transducer was developed using a piezoceramic composition adapted to high-power operation which is commonly used at standard MHz frequencies. After fabrication, the transducer was characterized. Using specific transmit-receive electronics and a water tank adapted to high-frequency devices, the transducer was excited using a short pulse to evaluate its bandwidth and imaging capabilities. Finally, it was excited by a one-period sine wave using several power levels to evaluate its capacity to produce high-intensity focused ultrasound at frequencies over 20 MHz.

Paper Details

Date Published: 25 March 2011
PDF: 6 pages
Proc. SPIE 7968, Medical Imaging 2011: Ultrasonic Imaging, Tomography, and Therapy, 79681C (25 March 2011); doi: 10.1117/12.878230
Show Author Affiliations
Wanda W. Wolny, Meggitt A/S (Denmark)
Jeffrey A. Ketterling, Riverside Research Institute (United States)
Franck Levassort, INSERM U930, CNRS, Univ. of Tours (France)
Rasmus Lou-Moeller, Meggitt A/S (Denmark)
Erwan Filoux, Riverside Research Institute (United States)
Jonathan Mamou, Riverside Research Institute (United States)
Ronald H. Silverman, Riverside Research Institute (United States)
Columbia Univ. Medical Ctr. (United States)
Marc Lethiecq, INSERM U930, CNRS, Univ. of Tours (France)

Published in SPIE Proceedings Vol. 7968:
Medical Imaging 2011: Ultrasonic Imaging, Tomography, and Therapy
Jan D'hooge; Marvin M. Doyley, Editor(s)

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