Cubic and Sphere Magnetic Nanoparticles for Magnetic Hyperthermia Therapy: Computational Results

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Thermal Therapy

Background:

• Magnetic nanoparticles (MNPs) offer promise for magnetic hyperthermia cancer therapy due to their magnetic and thermal properties.
• The efficacy of magnetic hyperthermia is significantly influenced by the physical characteristics of MNPs, including type, size, and shape.

Purpose of the Study:

• To investigate and compare the hyperthermic temperature distribution induced by cubic and spherical MNPs within simulated malignant and healthy tissues.
• To analyze the impact of MNP shape and dose on achieving therapeutic temperatures (40-45 °C) within tumoral regions.

Main Methods:

• A complex thermo-fluid model was developed in Comsol Multiphysics, integrating the bioheat transport equation (Pennes equation) to simulate MNP transport and heating.
• The space-time distribution of cubic and spherical MNPs within a concentric tissue configuration (malignant and healthy) was simulated under an external magnetic field.
• Calculations focused on MNP doses, expressed as a ratio of mass concentration to maximum clinical doses, to determine therapeutic temperature coverage.

Main Results:

• Cubic-shaped MNPs demonstrated a larger spatial distribution of therapeutic temperature within the tumoral volume compared to spherical MNPs.
• Lower doses of cubic MNPs achieved therapeutic hyperthermic temperatures in a greater volume of the tumoral region than equivalent doses of spherical MNPs.
• The study quantified the size of regions achieving therapeutic temperatures for various doses of cubic and spherical MNPs.

Conclusions:

• Cubic MNPs are more effective than spherical MNPs in achieving wider spatial distribution of therapeutic temperatures for magnetic hyperthermia.
• This computational thermo-fluid analysis provides a valuable tool for determining optimal MNP doses for effective hyperthermia treatment.
• The findings support the potential of specifically shaped MNPs to improve the efficacy and precision of magnetic hyperthermia therapies.