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    This study introduces an improved polarization inversion technique (PIT) for ultrasound transducers, enhancing ultrasound intensity for better tissue harmonic imaging and frequency compound imaging. The novel design boosts performance over conventional methods.

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    Area of Science:

    • Ultrasound transducer technology
    • Piezoelectric materials science
    • Medical imaging physics

    Background:

    • Conventional polarization inversion technique (PIT) in ultrasound transducers offers dual-frequency capabilities for tissue harmonic imaging (THI) and frequency compound imaging (FCI).
    • However, traditional PIT suffers from reduced ultrasound intensity and challenges with thin piezoelectric layers, limiting acoustic stack fabrication.
    • These limitations hinder the effective implementation of advanced ultrasound imaging techniques.

    Purpose of the Study:

    • To develop an improved polarization inversion technique (PIT) for ultrasound transducers that overcomes the limitations of conventional methods.
    • To enhance ultrasound intensity and facilitate the fabrication of PIT-based acoustic stacks.
    • To enable more effective implementation of tissue harmonic imaging (THI) and frequency compound imaging (FCI).

    Main Methods:

    • Proposed a novel PIT-based acoustic stack utilizing a piezo-composite layer on the front and a bulk-type piezoelectric layer on the back.
    • Employed a 0.5:0.5 thickness ratio between the two piezoelectric layers to generate a dual-frequency spectrum.
    • Conducted finite element analysis (FEA) simulations and fabricated a prototype transducer for experimental validation.

    Main Results:

    • The improved PIT design demonstrated a significant increase in ultrasound intensity compared to conventional PIT models.
    • Simulation results showed a 56.76% intensity increase, while experimental results indicated a 30.88% increase.
    • The novel transducer design successfully generated a dual-frequency spectrum suitable for THI and FCI.

    Conclusions:

    • The developed piezo-composite based PIT-transducer effectively compensates for the intensity reduction and fabrication challenges of conventional PIT.
    • The proposed transducer design offers enhanced performance for ultrasound imaging applications.
    • This improved PIT-based transducer is expected to be valuable for implementing advanced THI and FCI.