Nonlinear Metamaterial with a Capacitance Gradient for Magnetic Resonance Imaging

Yingyi Qi; Yakui Wang; Zhonghai Chi; Yi Yi; Xinxin Li; Maopeng Wu; Ruiguang Peng; Mingze Weng; Lixue Wang; Li He; Deqing Jiang; Sen Hou; Yonggang Meng; Zhuozhao Zheng; Bo Li; Qian Zhao; Ji Zhou

doi:10.1016/j.eng.2025.08.047

Engineering ›› :202508047 DOI: 10.1016/j.eng.2025.08.047

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Nonlinear Metamaterial with a Capacitance Gradient for Magnetic Resonance Imaging

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Abstract

Metamaterials based on split-ring resonators (SRRs) exhibit unique permeability and can increase the signal-to-noise ratio (SNR) of magnetic resonance imaging (MRI). However, the clinical applications of SRRs in MRI are hindered by inhomogeneous magnetic field distributions and interference in the transmitting magnetic field. In this study, we propose a metamaterial with a capacitance gradient and nonlinear frequency response. With the capacitance gradient strategy, we redistribute the enhancement performance of each SRR and increase the field homogeneity, paving the way for the design of a nonlinear frequency response. In addition, we eliminate the interference in the transmitting magnetic field using the nonlinearity control method proposed in our previous study, which renders the metamaterial applicable to all typical clinical sequences without any modifications prior to scanning. Clinically, the SNR achieved by the metamaterial is more than twice that achieved by a 12-channel wrist coil, which indicates that the metamaterial performs significantly better than state-of-the-art conventional commercial coils. Our study reveals the feasibility of clinical applications via metamaterials based on SRRs and may reform the composition of the radiofrequency coil system used in MRI. Consequently, coils fabricated using the metamaterial may dominate in the future.

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Metamaterial / Nonlinear / Magnetic resonance imaging / Split-ring resonators / Signal-to-noise ratio

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Yingyi Qi, Yakui Wang, Zhonghai Chi, Yi Yi, Xinxin Li, Maopeng Wu, Ruiguang Peng, Mingze Weng, Lixue Wang, Li He, Deqing Jiang, Sen Hou, Yonggang Meng, Zhuozhao Zheng, Bo Li, Qian Zhao, Ji Zhou. Nonlinear Metamaterial with a Capacitance Gradient for Magnetic Resonance Imaging. Engineering 202508047 DOI:10.1016/j.eng.2025.08.047

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