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Proceedings Paper

Miniature polymer transducers for high-frequency medical imaging
Author(s): Geoffrey R. Lockwood; Christopher R. Hazard
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Paper Abstract

High frequency polymer transducers have been used in a variety of medical imaging applications since they were first introduced by Sherar and Foster in the late 1980s. The transducers are intrinsically broadband and the flexibility of the polymer material makes fabrication relatively easy. Unfortunately, piezoelectric polymer materials have a low dielectric constant. Unless a large aperture is used, the electrical impedance of the transducer will be high, and the receiver sensitivity will be poor. This problem can be avoided by placing a high impedance pre-amplifier inside the transducer housing. Placing the pre-amplifier close to the transducer is important to avoid standing waves between the high output impedance of the transducer and the high input impedance of the pre-amplifier. We have recently developed a process for fabricating high frequency spherically shaped polymer transducers in which an integrated circuit die is mounted just beneath the surface of the transducer. In this paper we describe a theoretical and experimental analysis of the noise performance of these devices. The signal-to-noise ratio at the output of the pre-amplifier is estimated by combining a simple noise model for the amplifier with a KLM model of the transducer. This analysis provides a useful way of evaluating different transducer/pre-amplifier combinations. Excellent agreement between the model predictions and experimental results proves the validity of this approach.

Paper Details

Date Published: 1 May 1998
PDF: 9 pages
Proc. SPIE 3341, Medical Imaging 1998: Ultrasonic Transducer Engineering, (1 May 1998); doi: 10.1117/12.308005
Show Author Affiliations
Geoffrey R. Lockwood, Cleveland Clinic Foundation (United States)
Christopher R. Hazard, The Ohio State Univ. (United States)


Published in SPIE Proceedings Vol. 3341:
Medical Imaging 1998: Ultrasonic Transducer Engineering
K. Kirk Shung, Editor(s)

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