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Ultrasonic absorption in liver tissue.

L A Frizzell, E L Carstensen, J D Davis

    The Journal of the Acoustical Society of America
    |May 1, 1979
    PubMed
    Summary
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    Ultrasonic attenuation in mammalian liver is affected by sample preparation, particularly bubble formation. Careful preparation ensures in vitro measurements accurately reflect in vivo liver properties.

    Area of Science:

    • Biomedical Engineering
    • Acoustics
    • Mammalian Physiology

    Background:

    • Understanding tissue properties is crucial for medical imaging and therapy.
    • Ultrasonic attenuation in biological tissues is frequency-dependent.
    • Sample preparation can significantly influence ultrasonic measurements.

    Purpose of the Study:

    • To investigate the impact of sample preparation on ultrasonic attenuation coefficients in mammalian liver.
    • To determine the relationship between ultrasonic properties and frequency.
    • To assess the validity of in vitro samples for in vivo estimations.

    Main Methods:

    • Measured ultrasonic attenuation coefficients in mammalian liver across a frequency range of 0.5 to 10 MHz.
    • Examined various sample preparation techniques, including those introducing bubbles.

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  • Evaluated the effects of low-temperature storage and pressurization on attenuation.
  • Compared in vitro and in vivo absorption coefficients.

    • Main Results:

    • Certain preparation methods introduced bubbles, significantly increasing low-frequency attenuation.
    • Low-frequency attenuation decreased with low-temperature storage or pressurization, dissolving bubbles.
    • Prepared samples exhibited attenuation as a power function of frequency.
    • In vitro and in vivo absorption coefficients were similar and less sensitive to preparation.

    Conclusions:

    • Sample preparation critically affects ultrasonic attenuation measurements in liver tissue.
    • Carefully prepared in vitro liver samples provide reliable data indicative of in vivo properties.
    • Ultrasonic absorption is a more robust parameter than attenuation for in vivo assessments.