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A high-frequency annular-array transducer using an interdigital bonded 1-3 composite.

Hamid Reza Chabok1, Jonathan M Cannata, Hyung Ham Kim

  • 1NIH Resource Center for Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA. chabok@usc.edu

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PubMed
Summary
This summary is machine-generated.

Researchers developed a novel 1-3 composite annular-array transducer for high-frequency ultrasound imaging. This advanced transducer offers excellent performance, including a 33.5 MHz center frequency and 57% bandwidth, enabling detailed imaging capabilities.

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Area of Science:

  • Materials Science and Engineering
  • Biomedical Engineering
  • Acoustics and Ultrasonics

Background:

  • Development of advanced piezoelectric materials for high-frequency ultrasound applications.
  • Challenges in fabricating complex composite transducer structures with integrated electronics.
  • Need for high-resolution imaging in medical diagnostics, particularly for delicate tissues.

Purpose of the Study:

  • To design, fabricate, and characterize a novel 1-3 composite annular-array transducer.
  • To develop a simplified fabrication process for piezoelectric composites.
  • To evaluate the transducer's performance for high-frequency ultrasound imaging applications.

Main Methods:

  • Fabrication of an interdigital bonded (IB) 1-3 composite using piezoelectric ceramic.
  • Development of a novel method for removing metal electrodes from polymer kerfs.
  • Integration of matching and backing layers with a flexible circuit for interconnects.
  • Characterization using pulse-echo measurements and imaging of phantoms and biological samples.

Main Results:

  • Successful fabrication and testing of a prototype annular-array transducer.
  • Achieved an average center frequency of 33.5 MHz and a -6-dB fractional bandwidth of 57%.
  • Recorded an average insertion loss of 14.3 dB and crosstalk below -37 dB.
  • Demonstrated imaging capabilities with a wire phantom and excised porcine eye.

Conclusions:

  • The novel fabrication method simplifies the production of 1-3 composite transducers.
  • The characterized transducer exhibits excellent performance suitable for high-frequency ultrasound imaging.
  • The developed annular-array transducer shows promise for advanced medical imaging applications.