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Related Experiment Videos

Microprocessor-base system for ultrasonic tissue characterization

P K Bhagat, M P Kadaba, V N Gupta

    Medical Instrumentation
    |July 1, 1980
    PubMed
    Summary
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    A new ultrasonic system measures biologic tissue acoustics. Results show distinct acoustic properties, enabling tissue characterization through frequency-dependent attenuation.

    Area of Science:

    • Biomedical Engineering
    • Acoustics
    • Materials Science

    Background:

    • Accurate measurement of acoustic parameters in biologic media is crucial for understanding tissue properties.
    • Existing methods may lack precision or require specialized equipment for controlled environmental analysis.

    Purpose of the Study:

    • To develop and validate a microprocessor-based ultrasonic system for precise acoustic parameter measurement.
    • To characterize acoustic properties of various biologic tissues under controlled conditions.

    Main Methods:

    • Developed a system using pulse-echo electronics, minicomputers, and microcomputers for ultrasonic data acquisition.
    • Employed substitution technique for propagation velocity measurements.
    • Utilized peak amplitude and log power spectra difference methods for attenuation measurements on fresh and fixed tissues.

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    Main Results:

    • Soft tissue propagation velocity measured between 1530-1580 m/sec at 20°C.
    • Low velocity variation (<2%) among tissues and minimal dispersion (approx. 1.5%) across 1-10 MHz.
    • Attenuation coefficients increased linearly with frequency, with slopes varying by tissue type.

    Conclusions:

    • The developed ultrasonic system accurately measures acoustic parameters in biologic tissues.
    • Frequency-dependent attenuation characteristics offer a promising method for objective tissue characterization.
    • The system provides a foundation for further research into ultrasonic tissue analysis.