Temperature simulation of microwave ablation based on improved specific absorption rate method compared to phantom...

Area of Science:

• Electromagnetics
• Biomedical Engineering
• Thermal Physics

Background:

• Accurate simulation of temperature fields is crucial for microwave ablation procedures.
• Existing specific absorption rate (SAR) computation methods may lack precision in thermal modeling.
• Microwave fields, particularly at 2450 MHz, require refined simulation techniques for safety and efficacy.

Purpose of the Study:

• To develop an enhanced specific absorption rate (SAR) computation method by integrating thermal conductivity.
• To create mathematical simulation models utilizing the improved SAR for accurate temperature prediction.
• To validate the enhanced method's accuracy for 2450-MHz microwave fields.

Main Methods:

• Experimental data from a 2450-MHz microwave antenna and phantom were acquired.
• New SAR equations were derived based on Pennes' bio-heat transfer equation.
• Numerical simulations of SAR-derived temperature changes were performed and compared with experimental measurements.

Main Results:

• Simulated and measured temperature changes showed good agreement in phantom experiments.
• The maximum error between simulated and measured temperatures was under 6°C.
• Average error was below 2°C, with a standard deviation less than 1°C.

Conclusions:

• The proposed SAR-derived simulation method offers a significant simplification of the simulation process.
• This enhanced method improves the prediction accuracy of temperature fields in microwave ablation.
• The findings support the use of this method for more reliable microwave ablation simulations.