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Related Experiment Videos

An electromagnetic distance measuring system.

U Kebbel, H Hirche

    Medical Progress Through Technology
    |January 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    A novel method accurately measures myocardial deformation in vivo using a mutual inductance system with unique transducers. This advancement offers precise, rotationally invariant distance measurements for cardiac studies.

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    Area of Science:

    • Biomedical Engineering
    • Cardiovascular Physiology
    • Medical Instrumentation

    Background:

    • Assessing myocardial deformation is crucial for understanding cardiac function.
    • Existing methods may have limitations in accuracy or applicability in vivo.
    • A need exists for a robust, versatile system to measure cardiac mechanics.

    Purpose of the Study:

    • To introduce a new, accurate in vivo method for determining myocardial deformation.
    • To describe a system based on the mutual inductance principle with novel transducers.
    • To evaluate the system's accuracy, range, and applicability in biological environments.

    Main Methods:

    • Developed a system utilizing mutual inductance with three perpendicular coils for spherical sensing.
    • Transducers designed for rotational invariance and linear distance output.

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  • Tested accuracy, frequency response (100 Hz), and zero drift (<0.5% over 24 hours).
  • Utilized spherical (1.5 mm diameter, 5-25 mm range) and flat (5 mm diameter, 15-200 mm range) transducers.

    • Main Results:

    • Achieved distance measurement accuracy better than 1%.
    • System demonstrates rotational invariance, with residual angle dependence causing <4% deviation.
    • Measurements are feasible in various media, including biological tissues.
    • Demonstrated suitability for regional myocardial performance studies in the left ventricle.

    Conclusions:

    • The described mutual inductance system provides an accurate and versatile method for in vivo myocardial deformation assessment.
    • The unique transducer design enhances robustness against rotational movements.
    • This technology holds promise for advancing cardiovascular research and clinical diagnostics.