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Ultrasound pulse-echo reflection from test object cylindrical reflectors.

A Goldstein, B N Hung

    IEEE Transactions on Medical Imaging
    |January 1, 1982
    PubMed
    Summary
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    This study identifies optimal strong reflectors for ultrasound test objects. Metallic and plastic cylinders meeting specific wavelength-to-diameter ratios provide useful echoes for calibration and testing.

    Area of Science:

    • Materials Science
    • Ultrasonic Testing
    • Acoustics

    Background:

    • Standard reference reflectors are crucial for accurate pulse-echo ultrasound measurements.
    • Identifying optimal materials for these reflectors is essential for reliable test objects.

    Purpose of the Study:

    • To determine which strong reflectors are most effective for use in ultrasound test objects.
    • To compare the performance of various metallic and plastic cylindrical reflectors against a planar reference reflector.

    Main Methods:

    • Measurements of echo temporal voltage waveforms and frequency spectra were conducted.
    • Various metallic and plastic cylindrical reflectors were tested and compared to a planar reference reflector.
    • Mechanical and corrosion data were considered alongside acoustic performance.

    Related Experiment Videos

    Main Results:

    • Undistorted echoes were obtained from metallic cylinders when lambda > 3D and large attenuating plastic cylinders when lambda << D.
    • Thin stainless steel type 302, nickel, and molybdenum wires, along with thick Oilon Pv 80 rods, were identified as good reflectors.
    • Mechanical resonant frequencies of metallic cylinders showed potential as temperature-independent frequency standards.
    • Thin Teflon cylinders demonstrated utility for transducer axial resolution measurement.

    Conclusions:

    • Specific metallic and plastic cylinders are suitable as strong reflectors in ultrasound test objects.
    • The findings provide guidance for selecting materials for reliable ultrasound calibration and testing.
    • Mechanical resonant frequencies and Teflon cylinders offer additional applications in ultrasound metrology.