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A PMN-PT Composite-Based Circular Array for Endoscopic Ultrasonic Imaging.

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    A new endoscopic ultrasound (EUS) transducer using PMN-PT composite offers improved imaging and reliability over conventional PZT materials. This advancement promises enhanced biomedical ultrasonic devices for clinical diagnosis.

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    Area of Science:

    • Biomedical Engineering
    • Materials Science
    • Medical Imaging

    Background:

    • Conventional endoscopic ultrasound (EUS) transducers use lead zirconate titanate (PZT) ceramics, which have limitations in piezoelectric properties and mechanical flexibility.
    • The PZT material's inflexibility can lead to cracking during the circular transducer fabrication process, impacting device reliability.
    • Improving EUS transducer performance is crucial for enhanced gastrointestinal (GI) diagnostics and interventions.

    Purpose of the Study:

    • To develop a high-performance, reliable 128-element, 6.8-MHz circular array transducer for endoscopic ultrasound.
    • To utilize a lead magnesium niobate-lead titanate (PMN-PT) 1-3 composite material to overcome the limitations of conventional PZT ceramics.
    • To achieve superior imaging capabilities and mechanical robustness in EUS devices.

    Main Methods:

    • Fabrication of a 128-element, 6.8-MHz circular array transducer using a PMN-PT 1-3 composite.
    • Characterization of the transducer's electromechanical coupling coefficient (k33), bandwidth, sensitivity, and crosstalk.
    • Evaluation of the transducer's imaging performance using phantoms (wire, anechoic cyst) and ex-vivo swine intestine.

    Main Results:

    • The PMN-PT composite transducer demonstrated a high average electromechanical coupling coefficient (k33) and good mechanical flexibility.
    • Characterization revealed a large average bandwidth of 58% and high average sensitivity of 100 mVpp.
    • Crosstalk was measured to be less than -37 dB near the center frequency, indicating minimal signal interference.
    • Imaging tests confirmed the superior performance of the PMN-PT composite-based array transducer.

    Conclusions:

    • The developed PMN-PT composite-based EUS transducer exhibits enhanced imaging performance and device reliability compared to conventional PZT transducers.
    • The material's properties, including high electromechanical coupling and flexibility, are key to its improved performance.
    • This work paves the way for next-generation biomedical ultrasonic devices for advanced clinical diagnosis and treatment.