Enhancing B₁⁺ Field Homogeneity in 7T MRI Using Metasurfaces: Balancing Image Quality and Safety

Motivation: This study is motivated by the need to improve B₁⁺ field uniformity and image quality in 7T MRI while ensuring patient safety. Goal(s): The study aims to explore whether metasurfaces can enhance B₁⁺ field uniformity and signal strength in 7T while balancing improvements in image quality with safety constraints. Approach: The study employs electromagnetic simulations with metasurfaces positioned around the head during MRI scans to assess improvements in B₁⁺ field uniformity, alongside SAR measurements for safety evaluation. Results: The study achieved an increase in B₁⁺ field strength and improvement in field uniformity, confirming the efficacy of metasurfaces in enhancing 7T MRI image quality. Impact: This study's findings could lead to improved MRI diagnostics. It opens new avenues for investigating metasurface optimization and safety protocols, ultimately advancing high-field MRI applications and patient outcomes in neuroimaging.