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In vivo imaging using a copolymer phased array.

R L Goldberg1, S W Smith, L F Brown

  • 1Department of Biomedical Engineering, Duke University, Durham, NC 27706.

Ultrasonic Imaging
|July 1, 1992
PubMed
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This study demonstrates in vivo phased-array ultrasound imaging using a novel copolymer transducer array. While exhibiting lower sensitivity than PZT arrays, it successfully produced cardiac images.

Area of Science:

  • Biomedical Engineering
  • Ultrasound Technology
  • Materials Science

Background:

  • Phased-array ultrasound is crucial for medical imaging.
  • Developing advanced transducer materials is key to improving ultrasound performance.
  • Copolymer materials offer potential for novel ultrasound transducer fabrication.

Purpose of the Study:

  • To evaluate the feasibility of using a steered copolymer array for in vivo phased-array ultrasound imaging.
  • To characterize the performance of a 2.5 MHz copolymer transducer array.
  • To compare the copolymer array's performance against a conventional PZT array.

Main Methods:

  • Fabrication of a 32-element copolymer array using 28-micron film, resonant at 21 MHz.
  • Laser ablation for element creation and integration with custom IC preamplifiers.

Related Experiment Videos

  • In vivo imaging of a human heart using the copolymer phased-array system.
  • Performance comparison with a 3 MHz PZT array on a phased-array scanner.

    • Main Results:

    • Successful acquisition of in vivo phased-array ultrasound images of a human heart.
    • Copolymer array sensitivity was 28 dB lower than a comparable PZT array.
    • Copolymer elements showed a 6 dB pulse-echo angular response of 30 degrees with -35 dB interelement cross-coupling.
    • The effective center frequency was 2.5 MHz due to tissue attenuation and scanner bandwidth.

    Conclusions:

    • Copolymer arrays can be utilized for in vivo ultrasound imaging, though with reduced sensitivity compared to PZT.
    • The broad bandwidth of copolymer transducers influences the final image frequency spectrum.
    • Further research may optimize copolymer materials for enhanced ultrasound transducer performance.