Metasurface Resonator for 1.5 T MRI Based on BaTiO₃ Host Material

Area of Science:

• Biomedical Engineering
• Materials Science
• Physics

Background:

• Magnetic resonance imaging (MRI) is crucial for medical diagnosis and therapy.
• Enhancing MRI sensitivity is an active area of research, with focus on high dielectric constant (HDC) materials and metamaterials.
• Existing methods aim to passively improve MRI performance.

Purpose of the Study:

• To investigate a novel metasurface resonator for enhancing local transmit and receive efficiency in 1.5T MRI.
• To design a compact and safe device for practical application within MRI scanners.
• To evaluate the performance of the metasurface through simulations and experimental validation.

Main Methods:

• Fabrication of a metasurface using an array of non-magnetic rods in a barium titanate (BaTiO3) aqueous mixture.
• Utilizing BaTiO3's high dielectric permittivity (40-200 MHz) for device design.
• Performing electromagnetic simulations to predict magnetic field enhancement.
• Experimental validation of the metasurface's resonance frequency using a loop antenna and vector network analyzer (VNA).

Main Results:

• Simulations indicate a 50% enhancement in the magnetic field within the region-of-interest.
• The metasurface design leverages the high dielectric properties of BaTiO3 in water.
• Experimental validation confirmed the predicted resonance frequency of the metasurface.

Conclusions:

• The developed metasurface resonator shows significant potential for enhancing local efficiency in 1.5T MRI.
• The use of a BaTiO3 aqueous mixture offers a safe and compact solution for MRI applications.
• This technology could lead to improved image quality and diagnostic capabilities in clinical MRI.