Department of Radiology, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, China.
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, China.
Magn Reson Med. 2024 Feb;91(2):530-540. doi: 10.1002/mrm.29870. Epub 2023 Oct 10.
To investigate the application of a metasurface-inspired wireless coil and evaluate its performance in clinical knee MRI.
A metasurface surface coil is designed for knee MRI at 1.5T. The image SNR and uniformity are assessed using a water phantom. In vivo studies are performed on 10 healthy volunteers (age range, 24-30 y; three males) and two patients (ages 31 and 76 y; two males) with knee conditions. A commercial 4-channel flexible coil and a 12-channel knee coil are used for comparison. The SNRs of different tissues on knee MRI images are evaluated and compared. The image quality is evaluated using a five-point Likert scale.
The SNRs of the images acquired by the metasurface coil with spine coil as receiving coil are similar to the 12-channel knee coil, whereas the uniformity from groups where the metasurface coil was used is higher than that acquired by conventional coils in phantom studies. For in vivo knee MRI, the SNRs of the images acquired by the metasurface coil with spine coil as receiving coil are between that of the 4- and 12-channel phased-array coils. The image quality scores evaluated by radiologists are higher when metasurface is used.
The metasurface-inspired wireless coil is applicable to clinical knee MRI. When used in conjunction with the spine coil, it provides a favorable SNR between that of the 4- and 12-channel phased-array coil at 1.5T MRI system. The metasurface coil improves image uniformity regardless of which coil is used as the receiving coil.
研究一种基于超表面的无线线圈的应用，并评估其在临床膝关节 MRI 中的性能。
设计了一种用于 1.5T 膝关节 MRI 的超表面表面线圈。使用水模评估图像 SNR 和均匀性。在 10 名健康志愿者（年龄范围 24-30 岁；3 名男性）和 2 名膝关节疾病患者（年龄 31 岁和 76 岁；2 名男性）中进行了体内研究。使用商业 4 通道柔性线圈和 12 通道膝关节线圈进行比较。评估并比较膝关节 MRI 图像上不同组织的 SNR。使用五点 Likert 量表评估图像质量。
使用脊柱线圈作为接收线圈的超表面线圈获得的图像 SNR 与 12 通道膝关节线圈相似，而在体模研究中，超表面线圈组的均匀性高于传统线圈。对于体内膝关节 MRI，使用脊柱线圈作为接收线圈的超表面线圈获得的图像 SNR 介于 4 通道和 12 通道相控阵线圈之间。放射科医生评估的图像质量评分更高。
基于超表面的无线线圈适用于临床膝关节 MRI。当与脊柱线圈一起使用时，它在 1.5T MRI 系统中提供了介于 4 通道和 12 通道相控阵线圈之间的有利 SNR。无论使用哪个线圈作为接收线圈，超表面线圈都可以提高图像均匀性。
