Magnetic fluid hyperthermia simulations in evaluation of SAR calculation methods

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Therapeutic Technologies

Background:

• Magnetic fluid hyperthermia (MFH) is an emerging cancer treatment.
• Accurate quantification of Specific Absorption Rate (SAR) is crucial for effective MFH.
• Existing SAR calculation methods may not accurately reflect experimental conditions.

Purpose of the Study:

• To precisely compute Specific Absorption Rate as a function of temperature (SAR(T)) using MFH simulations.
• To evaluate the predictive accuracy of different SAR calculation methods.
• To develop a robust numerical model for hyperthermia treatment planning.

Main Methods:

• Experiments utilized magnetite-based nanofluids for MFH.
• SAR values were estimated using four methods: initial slope, Box-Lucas, corrected slope, and incremental analysis method (INCAM).
• A novel numerical model coupled heat transfer and Navier-Stokes equations, incorporating a Gaussian function for temperature-dependent power dissipation and Levenberg-Marquardt optimization.

Main Results:

• The incremental analysis method (INCAM) showed the lowest relative errors (0.62–15.03%) compared to simulations.
• Simulated SAR(T) functions displayed significant variations (up to 45%) within the MFH-relevant temperature range.
• Experimental SAR calculation methods demonstrated limitations in accurately quantifying heating efficiency.

Conclusions:

• Standard experimental SAR calculation methods are insufficient for precise heating efficiency quantification in MFH.
• Numerical models offer a powerful tool for accurate SAR(T) computation.
• Advanced numerical modeling can enhance the development of reliable hyperthermia treatment planning systems.