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1 August 2021 On-demand field shaping for enhanced magnetic resonance imaging using an ultrathin reconfigurable metasurface
Yang Zhao
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Proceedings Volume 11797, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIX; 117971C (2021) https://doi.org/10.1117/12.2594398
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States
Abstract
The signal-to-noise ratio (SNR) is the main figure of merit that assesses the quality of magnetic resonance imaging (MRI). Enhancing SNR oftentimes involves enhancing the magnetic field intensities of the constant homogenous magnetic field from the main coil, or the oscillating magnetic field from the radio frequency (RF) coil. Here we show that the SNR of MRI can also be improved by enhancing the coupling between the imaging subject and the receiving coil during the signal reception. We will provide a theoretical design of an ultrathin metasurface with micrometer thickness and high flexibility. Our metasurface can enhance the SNR by up to 28 times in the region of interest; at the same time, it is designed to minimally disturb the excitation fields by less than 1.6%, thus maintaining the uniformity of the excitation, important to achieve a high-quality MR image with minimal artifacts.
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Yang Zhao "On-demand field shaping for enhanced magnetic resonance imaging using an ultrathin reconfigurable metasurface", Proc. SPIE 11797, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIX, 117971C (1 August 2021); https://doi.org/10.1117/12.2594398
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KEYWORDS
Magnetic resonance imaging
Signal to noise ratio
Resonance enhancement
Magnetism
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