Electric Dipole Based Metasurfaces Enhance Targeted RF Power Deposition of Thermal Magnetic Resonance at 7.0T, 9.4T and 10.5T

This work proposes the feasibility of passive metasurface (MS) to enhance the RF power deposition for Thermal Magnetic Resonance based treatment of brain tumors. An 8 channel hybrid RF applicator combining dipole antenna and passive MS is designed and evaluated at 7.0 T (300 MHz), 9.4 T (400 MHz) and 10.5 T (450 MHz). MS with metal strips inside waterbolus was designed which generates expected resonant modes of the thermal intervention frequency. The result demonstrated use of passive metamaterial surface in RF applicator enhances the RF power deposition inside target volume for targeted RF heating of deep seated brain tumor.