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High Acoustic Impedance and Attenuation Backing for High-Frequency Focused P(VDF-TrFE)-Based Transducers.

Sean Toffessi Siewe1,2,3, Samuel Callé1, François Vander Meulen1

  • 1GREMAN, UMR 7347, University of Tours, CNRS, INSA Centre Val de la Loire, 37200 Tours, France.

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Summary

New composite backings enhance miniaturized ultrasonic transducers for medical imaging. Sintered bronze with tin or epoxy offers high acoustic impedance and attenuation, improving sensitivity and bandwidth for applications like small animal, skin, and eye imaging.

Keywords:
backinghigh-frequencyimagingtransducerultrasound

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Area of Science:

  • Materials Science
  • Acoustics
  • Biomedical Engineering

Background:

  • Piezoelectric P(VDF-TrFE) films are used in high-frequency ultrasonic transducers but have limited sensitivity due to low coupling coefficients.
  • Miniaturized high-frequency transducers require backing materials with high acoustic impedance (>25 MRayl) and strong attenuation for optimal sensitivity-bandwidth trade-off.
  • Medical applications like small animal, skin, and eye imaging necessitate advanced transducer designs.

Purpose of the Study:

  • To develop and characterize novel multiphasic composite backing materials for miniaturized, high-frequency ultrasonic transducers.
  • To evaluate the acoustic properties (impedance and attenuation) of sintered bronze composites impregnated with tin or epoxy resin.
  • To assess the performance of transducers incorporating these new backing materials for medical imaging applications.

Main Methods:

  • Porous sintered bronze with specific grain sizes was impregnated with tin or epoxy resin to create multiphasic composite backings.
  • Microstructural characterization was performed to analyze the composite composition, including the presence of an air phase.
  • Acoustic properties (impedance and attenuation) were measured for the sintered bronze-tin-air and sintered bronze-epoxy-air composites.
  • Focused single-element P(VDF-TrFE)-based transducers were fabricated using the developed backing materials and characterized for center frequency and bandwidth.
  • Imaging performance was evaluated using a pulse-echo system on a tungsten wire phantom.

Main Results:

  • The developed multiphasic composites, sintered bronze-tin-air and sintered bronze-epoxy-air, exhibited high acoustic impedances of 32.4 MRayl and 26.4 MRayl, respectively.
  • Attenuation coefficients were measured at 1.2 dB/mm/MHz for sintered bronze-tin-air and >4 dB/mm/MHz for sintered bronze-epoxy-air.
  • Transducers fabricated with these backings demonstrated a center frequency of 27 MHz and a -6 dB bandwidth of 65%.
  • Imaging tests on a 25 μm tungsten wire phantom confirmed the viability of these backings for miniaturized transducer applications.

Conclusions:

  • The novel sintered bronze-based composite backings offer suitable acoustic properties for miniaturized, high-frequency ultrasonic transducers.
  • These materials effectively address the sensitivity-bandwidth trade-off requirements for medical imaging applications.
  • The integration of these multiphasic backings in P(VDF-TrFE) transducers shows promise for advanced diagnostic imaging.