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Ultrasonically induced temperature elevation in mouse ovary.

K I Bailey, W D O'Brien, F Dunn

    Ultrasound in Medicine & Biology
    |July 1, 1984
    PubMed
    Summary
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    High-intensity ultrasound (1 MHz) can cause significant temperature increases in mouse ovaries. Exposures at 25 W/cm2 and above may lead to damaging thermal levels, while lower intensities are likely safe.

    Area of Science:

    • Reproductive biology
    • Biophysics
    • Medical imaging

    Background:

    • Ultrasound is widely used in medical diagnostics and therapeutics.
    • Understanding the thermal effects of ultrasound on sensitive tissues like ovaries is crucial for safety.
    • Previous research has indicated potential thermal risks associated with ultrasound exposure.

    Purpose of the Study:

    • To quantify temperature increases in mouse ovaries exposed to 1 MHz ultrasound.
    • To determine the threshold intensity of ultrasound exposure that causes significant thermal damage to ovarian tissue.
    • To evaluate the role of blood flow in mitigating ultrasound-induced hyperthermia.

    Main Methods:

    • In situ and exteriorized mouse ovaries were utilized for experiments.
    • Temperature changes were measured during exposure to varying intensities of 1 MHz ultrasound.

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  • Quantitative analysis of blood flow's heat dissipation capacity was performed.

    • Main Results:

    • Temperature increases were observed in both in situ and exteriorized ovaries.
    • Ultrasound exposures at 10 W/cm2 and below did not result in significant temperature increases.
    • Exposures at 25 W/cm2 and higher led to thermal levels capable of causing tissue damage.
    • Blood flow was found to play a significant role in dissipating heat generated by ultrasound.

    Conclusions:

    • Ultrasound exposure at intensities of 25 W/cm2 and greater poses a risk of thermal damage to ovarian tissue.
    • Lower ultrasound intensities (≤10 W/cm2) are likely safe regarding thermal effects.
    • Ovarian blood flow is a critical factor in managing ultrasound-induced hyperthermia.