Abstract This article presents a dual‐tuned (DT) radiofrequency (RF) coil for signal acquisition of 2 nuclei, namely, hydrogen ( 1 H) and sodium ( 23 Na), in the ultra‐high magnetic field of a 7‐T magnetic resonance imaging (MRI) system. The double‐layered dual‐tuned (DLDT) coil comprises a 2‐loop coil configuration per single‐pair geometry, with the 1 H and 23 Na coils being located on the outside and inside, respectively. The 1 H and 23 Na single‐pair elements are tuned to resonance frequencies of 297.20 and 78.61 MHz, respectively. The single‐pair geometry of the DLDT coil is extended to an 8‐pair configuration to cover the human head, and the operation mode is transmission/reception (Tx/Rx). The 8‐pair DLDT Tx/Rx coil array is designed with a non‐overlapped single pair between the 1 H coil elements for geometric decoupling, and capacitive decoupling is implemented to minimize the mutual inductance coupling. The 2 resonance frequencies are fed through a single RF port to a common matching board, and each frequency is selected using the voltages at both ends of a PIN diode. Through use of the PIN diode in the DLDT coil configuration, with a voltage drop at both ends, different resonance frequencies can be selected for each coil element in accordance with the diode ON/OFF state. The experiments conducted showed that the proposed DLDT coil is effective in acquiring signals of 1 H and 23 Na in the MRI system.

Sang‐Doc Han

Phil Heo

Han‐Joong Kim

Hyunwoo Song

Donghyuk Kim

Jeung‐Hoon Seo

Yeunchul Ryu

Young Noh

Kyoung‐Nam Kim

Concepts in Magnetic Resonance Part B

磁共振概念 B 部分汇集了参与设计和开发用于磁共振技术的硬件和软件的工程师和物理学家。该杂志欢迎主要来自磁共振成像 (MRI)、核磁共振 (NMR) 和电子顺磁共振 (EPR) 领域的投稿，但也鼓励提交与不太常见的磁共振成像和分析方法相关的投稿。学术界和工业界，报告仪器和计算机编程发展的最新进展，以支持医学、非医学和分析磁共振技术。

Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering brings together engineers and physicists involved in the design and development of hardware and software for magnetic resonance technology. The journal welcomes submissions primarily from the fields of Magnetic Resonance Imaging (MRI), Nuclear Magnetic Resonance (NMR), and Electron Paramagnetic Resonance (EPR), but also encourages contributions related to less common magnetic resonance imaging and analysis methods. Both academia and industry are invited to report the latest advancements in instrument and computer programming developments to support medical, non-medical, and analytical magnetic resonance technologies.

《Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering》汇集了参与设计和开发磁共振技术硬件和软件的工程师和物理学家。该杂志欢迎来自磁共振成像 (MRI)、核磁共振 (NMR) 和电子顺磁共振 (EPR) 领域的投稿，同时也鼓励与不太常见的磁共振成像和分析方法相关的研究。无论是学术界还是工业界，均可报告仪器和计算机编程发展的最新进展，以支持医学、非医学和分析磁共振技术。

Category	Quartile
医学	4
医学, 物理化学	4
医学, 仪器仪表	4
医学, 物理原子、分子和化学物理	4
医学, 光谱学	4

Double‐layered dual‐tuned RF coil using frequency‐selectable PIN‐diode control at 7‐T MRI

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