Tunable Metasurfaces for Switchable Magnetic Field Enhancement Regions in 1.5 T MRI.

IF 4.5 2区医学 Q2 ENGINEERING, BIOMEDICAL

IEEE Transactions on Biomedical Engineering Pub Date : 2025-10-07 DOI:10.1109/TBME.2025.3618475

Guoquan Chen, Xia Xiao, Yu Liu, Xiangzheng Kong, Jiannan Zhou

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引用次数: 0

Abstract

Metasurfaces have been reported to boost the signal-to-noise ratio (SNR) of magnetic resonance imaging (MRI) through their magnetic field enhancement capabilities. The varying region-of-interest (ROI) sizes in clinical imaging limit metasurfaces from realizing their potential, since the field enhancement regions of the most metasurfaces are fixed after fabrication. In this paper, a tunable metasurface (TMS) is proposed to significantly boost SNR of 1.5 T MRI in regions with different sizes. The TMS is composed of unit cells that contain a planar metal spiral loaded with a variable capacitor and placed on a square dielectric substrate. The feasibility of switching between a wide enhancement region (WER) mode and a narrow enhancement region (NER) mode by adjusting the capacitance is validated through simulations and experiments. The enhancement of the magnetic field by the WER mode of TMS boosts the SNR of the human brain voxel model by a maximum of 14.01 times, reaching a higher value of 22.81 times with the NER mode. This work offers an effective approach that can change the region sizes of field enhancement flexibly, enabling metasurfaces to adapt for various MRI scenarios such as disease detection in the large region or therapeutic monitoring in the specific small region.

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1.5 T MRI中可切换磁场增强区的可调超表面。

据报道，超表面通过其磁场增强能力提高磁共振成像（MRI）的信噪比（SNR）。临床成像中不同的感兴趣区域（ROI）大小限制了超表面发挥其潜力，因为大多数超表面的场增强区域在制造后是固定的。本文提出了一种可调谐的超表面（TMS），可以显著提高1.5 T MRI不同大小区域的信噪比。TMS由单元电池组成，单元电池包含一个装有可变电容器的平面金属螺旋，并放置在方形电介质衬底上。通过仿真和实验验证了通过调节电容在宽增强区（WER）模式和窄增强区（NER）模式之间切换的可行性。经颅磁刺激的WER模式对磁场的增强使人脑体素模型的信噪比最大提高了14.01倍，NER模式的信噪比达到了22.81倍。这项工作提供了一种有效的方法，可以灵活地改变场增强的区域大小，使超表面适应各种MRI场景，如大区域的疾病检测或特定小区域的治疗监测。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Biomedical Engineering 工程技术-工程：生物医学

CiteScore

9.40

自引率

4.30%

发文量

880

审稿时长

2.5 months

期刊介绍： IEEE Transactions on Biomedical Engineering contains basic and applied papers dealing with biomedical engineering. Papers range from engineering development in methods and techniques with biomedical applications to experimental and clinical investigations with engineering contributions.