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Heating of tissues by microwaves: a model analysis
K R Foster1, A Lozano-Nieto, P J Riu
1Department of Bioengineering, University of Pennsylvania, Philadelphia 19104-6392, USA. kfoster@eniac.seas.upenn.edu
Bioelectromagnetics
|October 15, 1998
Summary
Tissue heating from nonionizing radiation depends on blood flow and conduction time constants. This study models thermal response to establish averaging times for safe microwave exposure standards.
Area of Science:
- Biophysics
- Thermal Physiology
- Radiation Biology
Background:
- Nonionizing radiation (microwave, infrared) causes tissue heating.
- Understanding thermal response is crucial for safety standards.
Purpose of the Study:
- Analyze tissue thermal response times to nonionizing radiation.
- Develop a thermal averaging time for human exposure standards.
Main Methods:
- Dimensionless bioheat equation analysis.
- Modeling two idealized tissue heating scenarios.
- Calculating effective time constants for thermal response.
Main Results:
- Thermal response governed by blood flow (tau1) and conduction (tau2) time constants.
- Steady-state temperature increase depends on power density and effective time constant.
- Model predictions align with microwave warmth/pain perception data.
Conclusions:
- Developed a thermal averaging time for pulsed microwave radiation standards.
- Compared ANSI standards for microwave and infrared radiation safety.
- Provided historical context for microwave exposure averaging times.
