Influence of backing and matching layers in ultrasound transducer performance

Valeria Monteiro do Nascimento; Vera Lúcia da Silveira Nantes Button; Joaquim Miguel Maia; Eduardo Tavares Costa; Eduardo Jorge Valadares Oliveira

doi:10.1117/12.479924

23 May 2003 Influence of backing and matching layers in ultrasound transducer performance

Valeria Monteiro do Nascimento, Vera Lúcia da Silveira Nantes Button, Joaquim Miguel Maia, Eduardo Tavares Costa, Eduardo Jorge Valadares Oliveira

Author Affiliations +

Proceedings Volume 5035, Medical Imaging 2003: Ultrasonic Imaging and Signal Processing; (2003) https://doi.org/10.1117/12.479924
Event: Medical Imaging 2003, 2003, San Diego, California, United States

Abstract

In this work we have investigated the influence of the backing layer composition and the matching layer thickness in the performance of ultrasound transducers constructed with piezoelectric ceramic disks. We have constructed transducers with backing layers of different compositions, using mixtures of epoxy with alumina powder and/or Tungsten powder and with λ/4 or 3λ/4 thickness epoxy matching layers. The evaluation tests were performed in pulse-echo mode, with a flat target, and in transmission/reception mode, with a calibrated PVDF hydrophone. The acoustical field emitted by each transducer was mapped in order to measure the on-axis and transverse field profiles, the aperture size and the beam spreading. The bandwidths of the transducers were determined in pulse-echo mode. Comparing the evaluation tests results of two transducers constructed with the same backing layer, the one constructed with λ/4 thickness epoxy matching layer showed better performance. The results showed that the transducers constructed with epoxy, alumina and Tungsten powders backing layers have larger bandwidth. The larger depth of field was measured for transducers constructed with epoxy and Tungsten powder backing layers. These transducers and those constructed with epoxy, Tungsten and alumina powders backing layers showed the larger field intensities in the measured transverse profiles.

Citation Download Citation

Valeria Monteiro do Nascimento, Vera Lúcia da Silveira Nantes Button, Joaquim Miguel Maia, Eduardo Tavares Costa, and Eduardo Jorge Valadares Oliveira "Influence of backing and matching layers in ultrasound transducer performance", Proc. SPIE 5035, Medical Imaging 2003: Ultrasonic Imaging and Signal Processing, (23 May 2003); https://doi.org/10.1117/12.479924

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