Adaptive Cylindrical Wireless Metasurfaces in Clinical Magnetic Resonance Imaging
Adaptive Cylindrical Wireless Metasurfaces in Clinical Magnetic Resonance Imaging
复制标题
临床磁共振成像中的自适应圆柱形无线超表面
DOI：
10.1002/adma.202102469
复制
发表时间：
2021-08-17
影响因子：
29.4
通讯作者：
Zhou, Ji
中科院分区：
文献类型：
--
作者：
Chi, Zhonghai;Yi, Yi;Zhou, Ji
信噪比是衡量磁共振成像（MRI）图像质量的重要指标之一，具有独特电磁特性的超表面为信噪比的改善提供了新的途径。然而，其在临床MRI中的应用受到磁场不均匀增强和射频（RF）发射场干扰的高度限制。在这项研究中，自适应圆柱形无线元表面（ACWM）均匀的场增强和自适应谐振模式的报告。ACWM在部分（发射周期）和全（接收周期）谐振模式之间自动切换，不仅消除了射频发射场的干扰，而且大大提高了信噪比。它的适应性也使得ACWM适用于所有常见的临床序列，而无需对扫描参数进行任何修改。与传统线圈相比，ACWM采集的人手腕MRI图像的SNR是2到4倍。这项工作提供了一种实用的控制方法，以填补临床前研究和医疗应用之间的科学知识差距的超表面，并提出了一种新的和强大的工具，用于诊断和评估人类疾病。
The signal-to-noise ratio (SNR) is one of the most important criteria for evaluating the image quality in magnetic resonance imaging (MRI), and metasurfaces with unique electromagnetic properties provide a novel method for SNR improvement. However, their applications in clinical MRI are highly restricted by the inhomogeneous enhancement of the magnetic field and interference in the radio frequency (RF) transmitting field. In this study, an adaptive cylindrical wireless metasurface (ACWM) with homogeneous field enhancement and adaptive resonant modes is reported. The ACWM automatically switches its resonant modes between the partial (transmitting period) and whole (receiving period) resonance, which enables it to not only eliminate the interference in RF transmitting field, but also greatly enhance the SNR. Its adaptability also makes the ACWM applicable to all common clinical sequences without any modifications in the scan parameters. The SNR of MRI images of the human wrist, acquired with ACWM, is two to four times compared with the conventional coil. This work offers a practical control method to fill the scientific knowledge gaps between the preclinical research and medical applications for metasurfaces, and suggests a novel and powerful tool for diagnosing and evaluating human diseases.