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Efficiency function: improvement of classical bioheat approach

H Brinck1, J Werner

  • 1Institut für Physiologie, Ruhr-Universität, Bochum, Germany.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 1, 1994
PubMed
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Simple models of human body heat transfer, like Pennes' bioheat equation, are often inaccurate under cold or localized heat stress. An "efficiency function" improves accuracy by considering perfusion and tissue depth, offering a practical alternative to complex vascular models.

Area of Science:

  • Physiology
  • Biophysics
  • Heat Transfer

Background:

  • Convective heat transfer in human tissues is complex due to vascular architecture.
  • Pennes' bioheat equation, a common non-vascular model, has limitations.
  • Accurate modeling is crucial for understanding thermal regulation and therapeutic applications.

Purpose of the Study:

  • To evaluate the accuracy of simple non-vascular models for human body heat transfer.
  • To develop a more reliable and practical model for convective heat transfer in tissues.
  • To introduce the efficiency function concept for correcting existing bioheat models.

Main Methods:

  • Utilized a complex 3D vascular model of human extremity tissue.
  • Compared results from the vascular model with Pennes' bioheat equation.

Related Experiment Videos

  • Developed and tested an "efficiency function" based on perfusion rate and tissue depth.

    • Main Results:

    • Pennes' bioheat equation provides acceptable results only in thermoneutral conditions or uniform heat stress.
    • Unreliable predictions are observed with Pennes' model during cold stress or local hyperthermia.
    • The efficiency function concept demonstrated reasonable agreement with both the complex vascular model and experimental data.

    Conclusions:

    • The classical Pennes bioheat approach is insufficient for non-uniform thermal conditions.
    • The efficiency function offers a practical and accurate correction to the Pennes bioheat model.
    • This approach enhances the reliability of bioheat transfer modeling in human tissues.