Ultra-high field (UHF) MRI, such as 7T can visualize the brain in significantly improved detail through enhanced signal-to-noise ratio and contrast mechanisms. However, when the wavelength becomes comparable with the body dimensions, excitation radiofrequency (RF) field homogeneity at UHF systems is impaired by wavelength effects. Here we report a novel RF resonator sheet design with a simple circuit structure that couples inductively to the RF coil to enhance RF transmit homogeneity, efficiency, and signal sensitivity. In-vivo human experiment results demonstrate the feasibility and effectiveness of this method in brain MRI at 7T.
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