Analysis and optimization of waveguide multiapplicator hyperthermia systems

Area of Science:

• Electromagnetics and Applied Physics
• Biomedical Engineering
• Medical Physics

Background:

• Hyperthermia treatment requires precise control of radiofrequency energy deposition.
• Optimizing antenna array excitation is crucial for achieving targeted heating in deep-seated tumors.
• Existing methods may face challenges in achieving desired specific absorption rate (SAR) distributions within complex biological tissues.

Purpose of the Study:

• To propose and validate a novel method for determining antenna array excitation coefficients.
• To optimize SAR distribution for enhanced hyperthermia treatment of deep-seated tumors.
• To investigate the application of this method in a realistic waveguide model representing the human torso.

Main Methods:

• A method for calculating antenna array excitation coefficients was developed.
• Optimization was performed to improve SAR distribution around a simulated deep tumor.
• A two-dimensional waveguide model, representing a torso section, was used for simulations.
• Numerical simulations were conducted to assess the method's effectiveness.

Main Results:

• The proposed method successfully determined optimal excitation coefficients for the antenna array.
• Simulations demonstrated improved SAR distributions compared to non-optimized scenarios.
• The approach showed effectiveness even when the array operated below the waveguide's dominant mode cutoff frequency.

Conclusions:

• The developed method offers a viable approach for enhancing SAR distribution in hyperthermia.
• Optimized antenna array excitation can significantly improve the efficacy of deep-seated tumor treatment.
• This technique holds promise for advancing targeted energy delivery in clinical hyperthermia applications.