Institute of Applied Physics, University of Tsukuba.
Department of Radiological Sciences, School of Health Sciences at Narita, International University of Health and Welfare.
Magn Reson Med Sci. 2023 Jan 1;22(1):103-115. doi: 10.2463/mrms.tn.2021-0094. Epub 2021 Dec 10.
Na-MRI provides information on Na content, and its application in the medical field has been highly anticipated. However, for existing clinical H-MRI systems, its implementation requires an additional broadband RF transmitter, dedicated transceivers, and RF coils for Na imaging. However, a standard medical MRI system cannot often be modified to perform Na imaging. We have developed an add-on crossband RF repeater system that enables Na-MRI simply by inserting it into the magnet bore of an existing H MRI. The three axis gradient fields controlled by the H-MRI system were directly used for Na imaging without any deformation. A crossband repeater is a common technique used for amateur radio. This concept was proven by a saline solution phantom and in vivo mouse experiments. This add-on RF platform is applicable to medical H MRI systems and can enhance the application of Na-MRI in clinical usage.
Na-MRI 可提供关于 Na 含量的信息，其在医学领域的应用备受期待。然而，对于现有的临床 H-MRI 系统，其实施需要额外的宽带 RF 发射器、专用收发器和用于 Na 成像的 RF 线圈。然而，标准的医疗 MRI 系统通常无法进行修改以执行 Na 成像。我们开发了一种附加的带外 RF 转发器系统，只需将其插入现有的 H MRI 的磁体孔中，即可实现 Na-MRI。由 H-MRI 系统控制的三轴梯度场可直接用于 Na 成像，而不会发生任何变形。带外转发器是业余无线电中常用的一种技术。盐水溶液体模和体内小鼠实验证明了这一概念。该附加的 RF 平台适用于医疗 H MRI 系统，并可以增强 Na-MRI 在临床应用中的应用。
