There is a growing interest in ultra-high field magnetic resonance neuroimaging because of the greater signal-to-noise ratio (SNR) compared with conventional field strengths. However, visualization at these higher field strengths and Larmor frequencies is challenged by wavelength effects, compromising anatomical coverage of commercial coils. A novel metasurface based on a hybrid structure consisting of an array of broadside-coupled split-ring resonators and high permittivity materials was designed to augment signal at the 7 Tesla 1H Larmor frequency. This reusable surface device markedly improves SNR in caudal head structures that have historically been limited by poor signal.
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