Automatic control of finite element models for temperature-controlled radiofrequency ablation

Area of Science:

• Computational modeling
• Biomedical engineering

Background:

• Finite Element Method (FEM) is used for cardiac and hepatic radiofrequency (RF) ablation simulations.
• Manual power adjustments are common in temperature-controlled RF ablation due to lack of automated control in commercial FEM packages.

Purpose of the Study:

• To develop and implement an automated temperature control system for RF ablation simulations.
• To integrate a Proportional-Integral (PI) controller with a FEM model for precise temperature regulation.

Main Methods:

• A C++ program with a PI controller was developed to monitor and adjust electrode tip temperature.
• A closed-loop system was created, combining the FEM model with the control software.
• Control parameters were optimized through closed-loop system simulations.

Main Results:

• A 3-D FEM model of a RITA model 30 electrode demonstrated effective temperature control.
• The software successfully maintained electrode temperatures at a target of 100°C.
• Simulations showed strong correlation between the closed-loop system and the FEM model, enabling parameter optimization.

Conclusions:

• Automated closed-loop control significantly simplifies temperature-controlled RF ablation simulations.
• This method reduces user input and enhances the accuracy of RF ablation modeling.