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Related Experiment Videos

[Evaluation of air segment plethysmography using computer tomography].

A de Marées, K Barbey, G Kunitsch

    Zeitschrift Fur Kardiologie
    |May 1, 1984
    PubMed
    Summary
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    Computer tomography and planimetry precisely measure calf tissue volume, revealing inaccuracies in traditional cylinder formulas. Venoextensiometry offers sufficient precision for measuring pressure-dependent venous capacity.

    Area of Science:

    • Biomedical Engineering
    • Anatomy
    • Physiology

    Background:

    • Calf tissue volume measurement is crucial for understanding limb physiology.
    • Traditional methods like cylinder formulas may overestimate tissue volume.
    • Accurate venous capacity measurement is essential for diagnosing vascular conditions.

    Purpose of the Study:

    • To evaluate the precision of computer tomography and planimetry for calf tissue volume measurement.
    • To compare venous capacity measurements obtained by computer tomography and air segment plethysmography.
    • To assess the impact of sensor application on volume and venous capacity measurements.
    • To validate the precision of venoextensiometry for pressure-dependent venous capacity.

    Main Methods:

    • Calf tissue volume measured using computer tomography and planimetry.

    Related Experiment Videos

  • Venous capacity assessed via computer tomography and air segment plethysmography.
  • Effect of skin sensor application on volume and venous capacity quantified.
  • Pressure-dependent venous capacity measured with and without sensors, controlled by computer tomography.

    • Main Results:

    • Computer tomography and planimetry indicated calf tissue volume with minimal bony component (9.3%) and significant soft tissue volume (90.7%).
    • Cylinder formula approximations resulted in 5-15% overestimation of calf tissue volume.
    • A 5% difference was observed between computer tomography and air segment plethysmography for venous capacity.
    • Sensor application caused a 5.4% reduction in total volume, impacting blood volume, but resulted in only a 2.1% difference in pressure-dependent venous capacity measurements.

    Conclusions:

    • Computer tomography and planimetry provide accurate calf tissue volume measurements.
    • Venoextensiometry demonstrates sufficient precision for measuring pressure-dependent venous capacity, even with sensor application.
    • Findings suggest venoextensiometry is a reliable method for assessing venous function in the calf.