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Development of a Coherent Model for Radiometric Core Body Temperature Sensing
Katrina Tisdale1, Alexandra Bringer1, Asimina Kiourti1
1Ohio State University ElectroScience Laboratory, Columbus, OH 43212 USA.
Summary
This study models human core temperature using microwave radiometry, incorporating population variations for improved accuracy. The physics-based model enhances on-body radiometer development for widespread use.
Area of Science:
- Biomedical Engineering
- Electromagnetics
- Thermodynamics
Background:
- Accurate human core temperature measurement is critical for medical diagnostics.
- Existing methods for core temperature monitoring have limitations.
- Microwave radiometry offers a non-invasive approach for temperature sensing.
Purpose of the Study:
- To evaluate a wideband, physics-based model for determining human core body or brain temperature using microwave radiometry.
- To investigate the impact of human population variations on temperature measurements.
- To inform the development of accurate, population-wide on-body radiometers.
Main Methods:
- Applied Pennes's bioheat equation to a six-layer human head model to simulate temperature profiles during fever.
- Utilized a forward electromagnetic (EM) model to calculate emitted brightness temperature.
- Incorporated population variation statistics for thermal and EM parameters using Monte Carlo simulations (0.1 MHz to 10 GHz).
Main Results:
- Simulations show that thermal parameter variations influence the offset of the brightness temperature signature.
- Electromagnetic (EM) parameter variations shift key maxima and minima in the brightness temperature signature due to wave interference.
- Population-representative variable distributions significantly affect emitted brightness temperature.
Conclusions:
- A wideband, physics-based model is effective for core temperature determination via microwave radiometry.
- Accounting for population variations is crucial for accurate radiometry-based temperature retrieval.
- The findings support the development of on-body radiometers for diverse populations.
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