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Interleaved Array Transducer with Polarization Inversion Technique to Implement Ultrasound Tissue Harmonic Imaging.

Chan Yuk Park1, Jin Ho Sung1, Eun Young Jeong1

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Summary

This study introduces an improved interleaved array transducer for ultrasound tissue harmonic imaging (THI). The novel design achieves a 90% broad bandwidth for efficient transmission and reception, enabling high-resolution imaging.

Keywords:
finite element analysis (FEA) simulationinterdigital bonding processinterleaved array transducerpolarization inversion techniquetissue harmonic imaging

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Materials Science

Background:

  • Ultrasound Tissue Harmonic Imaging (THI) requires array transducers with broad bandwidths.
  • Developing broad bandwidth transducers is challenging due to piezoelectric material resonance limitations.
  • Existing transducers struggle to efficiently cover both fundamental (f0) and second harmonic (2f0) frequencies.

Purpose of the Study:

  • To present an improved interleaved array transducer design for THI.
  • To introduce a dedicated fabrication scheme for the proposed transducer.
  • To demonstrate the feasibility of achieving broad bandwidths for THI applications.

Main Methods:

  • Designed a novel interleaved array transducer structure.
  • Incorporated conventional elements (f0) and polarization-inverted elements (2f0) alternately.
  • Utilized identical piezoelectric element thicknesses and validated through finite element analysis (FEA) and prototype experiments.

Main Results:

  • The proposed transducer efficiently transmits f0 and receives 2f0 ultrasound frequencies.
  • Achieved a 90% broad bandwidth, significantly enhancing transducer performance.
  • FEA simulations and experimental results confirmed the design's effectiveness.

Conclusions:

  • The improved interleaved array transducer is suitable for THI.
  • This technique offers a viable method for implementing high-resolution THI.
  • The novel structure overcomes previous bandwidth limitations in piezoelectric transducers.