Computational Design of a Thermal Applicator for Brain Hyperthermia Controlled by Capacitor Positioning in Loop Coils

Area of Science:

• Biomedical Engineering
• Medical Physics
• Oncology

Background:

• Hyperthermia therapy uses heat to damage or kill cancer cells and aid drug delivery.
• Precise heat application is crucial to target cancerous tissue while sparing healthy cells.
• Developing effective heat applicators for localized treatment is a key challenge in oncology.

Purpose of the Study:

• To optimize an array coil for brain hyperthermia, enhancing its use with Magnetic Resonance Imaging (MRI).
• To develop a system capable of delivering targeted heat to cancerous areas within the brain.
• To improve the precision of heat application in hyperthermia cancer treatment.

Main Methods:

• Array coils were optimized by adjusting capacitor positions on loop coils.
• Electromagnetic simulations were used to compute electric fields and temperature distributions.
• The optimized coils were compared against a standard symmetric coil array for head heating.

Main Results:

• The optimized coil array successfully focused electric fields and elevated temperatures in targeted tumor areas.
• The proposed method achieved focused heating, with temperatures in Tumor 1 and Tumor 2 at 42.5°C and 42.9°C respectively.
• While a standard method showed higher peak temperatures, it also resulted in greater temperature increases outside the tumor regions.

Conclusions:

• The study successfully demonstrated the optimization of array coils for focused hyperthermia.
• Varying capacitor positions in array coils enables precise control over heat application.
• This optimized approach offers improved targeting for brain hyperthermia treatments.