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Ultrasonic microstreaming and related phenomena

W L Nyborg

    The British Journal of Cancer. Supplement
    |March 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Low intensity ultrasound affects biological tissues when micron-sized gas pores are present. Pulsating gas bodies generate unique forces and microstreaming, likely causing biological effects.

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    Current status of research on biophysical effects of ultrasound.

    Ultrasound in medicine & biology·1994

    Area of Science:

    • Biophysics
    • Cell Biology
    • Acoustics

    Background:

    • Biological cells and tissues can be influenced by physical stimuli.
    • Ultrasound is a recognized tool in medical imaging and therapy.
    • The interaction of ultrasound with biological structures at the microscale is an area of active research.

    Purpose of the Study:

    • To investigate the effects of low intensity ultrasound on biological cells and tissues.
    • To understand the mechanisms by which ultrasound interacts with micro-scale gas structures.
    • To explore the role of radiation pressure, forces, torque, and microstreaming in ultrasound-induced biological effects.

    Main Methods:

    • Exposure of biological cells and tissues to low intensity ultrasound in the lower megahertz frequency range.

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  • Observation and analysis of the behavior of gas-filled channels or pores (dimensions of a few microns) under ultrasound.
  • Characterization of forces (radiation pressure, torque) and fluid dynamics (microstreaming) generated by pulsating gas bodies.

    • Main Results:

    • Biological cells and tissues are demonstrably affected by low intensity ultrasound when micron-sized gas-filled pores are present.
    • Pulsation of these gas bodies generates unique radiation pressure, forces, and torque.
    • Microstreaming, characterized by small-scale eddying in liquids, is generated by the pulsating gas bodies.

    Conclusions:

    • The interaction of low intensity ultrasound with micro-scale gas structures is a key factor in biological effects.
    • Radiation pressure, unique forces, torque, and microstreaming are the probable mechanisms underlying these biological responses.
    • Further research into these phenomena could elucidate ultrasound's role in biological systems.