Perfused phantom models of microwave irradiated tissue

Area of Science:

• Biomedical Engineering
• Thermal Physics
• Medical Imaging

Background:

• Accurate thermal modeling of biological tissues is crucial for effective hyperthermia treatments.
• Pennes' bioheat equation is widely used but its applicability to complex scenarios requires further validation.
• Simulating blood perfusion effects is essential for realistic thermal response prediction.

Purpose of the Study:

• To develop and test a perfused phantom model for simulating microwave-heated tissue.
• To evaluate the accuracy of Pennes' bioheat equation using the developed phantom.
• To investigate the relationship between phantom design parameters and simulated perfusion rates.

Main Methods:

• A parallel tube heat exchanger configuration was employed to mimic blood flow convection.
• Theoretical analysis was conducted to compare the phantom's thermal response with Pennes' bioheat equation.
• A prototype phantom was constructed and tested with a hyperthermia applicator.
• Parametric studies explored the influence of tube dimensions and material properties on simulated perfusion.

Main Results:

• The phantom's global thermal response closely matched predictions from Pennes' bioheat equation.
• A parametric study established relationships between design parameters and simulated perfusion.
• Experimental results from the prototype validated the theoretical findings.
• Measured thermal response favorably compared with numerical solutions of the bioheat equation.

Conclusions:

• The developed perfused phantom model serves as a valuable tool for simulating microwave-heated tissue.
• The study confirms the robustness and applicability of Pennes' bioheat equation in hyperthermia modeling.
• Findings provide insights into the successful application of the bioheat equation for real tissue thermal response prediction.