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Related Concept Videos

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

987
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
987

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    Inkjet-printed poly(vinylidene fluoride-trifluoroethylene) films fabricated a high-frequency annular array prototype. This transducer achieved a 143% fractional bandwidth, demonstrating potential for advanced ultrasound imaging applications.

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    Area of Science:

    • Materials Science
    • Ultrasound Transducer Technology
    • Medical Imaging Physics

    Background:

    • Poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] is a piezoelectric polymer with potential for ultrasound transducer fabrication.
    • Inkjet printing offers a novel, precise method for depositing thin films for electronic applications.
    • High-frequency ultrasound transducers require materials with excellent electromechanical properties and precise fabrication.

    Purpose of the Study:

    • To develop a high-frequency annular array prototype using inkjet-printed P(VDF-TrFE) films on silicon wafers.
    • To evaluate the electromechanical performance and acoustic characteristics of the fabricated transducer.
    • To demonstrate the efficacy of dynamic focusing for improved image quality in ultrasound applications.

    Main Methods:

    • Fabrication of P(VDF-TrFE) films on silicon wafers via inkjet printing.
    • Characterization of film thickness (~11 µm) and effective thickness coupling factor (22%).
    • Integration of a polymer lens for acoustic focusing and development of custom electronics for simultaneous emission and dynamic reception focusing.

    Main Results:

    • The prototype annular array operated at a center frequency of 21.3 MHz with a low insertion loss of 48.5 dB.
    • Achieved a wide -6-dB fractional bandwidth of 143%, prioritizing bandwidth over sensitivity.
    • Dynamic focusing on reception improved lateral resolution (FWHM) in wire phantom imaging at various depths.

    Conclusions:

    • Inkjet printing is a viable method for fabricating high-frequency ultrasound transducers with P(VDF-TrFE).
    • The developed prototype demonstrates excellent bandwidth and the benefits of dynamic focusing for ultrasound imaging.
    • Future work should focus on increasing acoustic attenuation in silicon wafers for fully operational multielement transducers.