| Popis: |
With the expanding accessibility of ultrahigh field MRI frameworks, researching on non-proton nuclei (X-nuclei), such as 23Na and 31P, have attracted wide attention. There are varieties of possibilities for in-depth study of this substance: firstly, it may shed light on cellular processes and energy metabolism in the field of biological tissues. Secondly, based on the first factor, it assists us to link pathological conditions to neurodegenerative diseases by displaying the nucleus. During the research, it has been found that this substance requires a well-designed radio frequency (RF) system comprising a multi-tuning RF coil. However, the intrinsic sensitivity of the aprotic nuclei is lower than 1 H, it’s crucial to guarantee the signal-to-noise ratio (SNR) of the X-nuclei is as secondary as time permits. In this paper, a thorough overview of past works on configuration idea of multi-tuned coils. The primary figures of the review will be arranged into two parts: 1) State-of-the-art according to the single design structures and 2) Discussion of relevant new technologies. Further descriptions are illustrated in each subsections regarding to the detailed methodologies of dual-tuned coils, including usage of metamaterial, nested, traps and PIN-diodes, together with explanations of the novelty, best solution and trade-off. |
