Double-layered dual-tuned RF coil using frequency-selectable PIN-diode control at 7-T MRI
- Authors
- Han, Sang-Doc; Heo, Phil; Kim, Han-Joong; Song, Hyunwoo; Kim, Donghyuk; Seo, Jeung-Hoon; Ryu, Yeunchul; Noh, Young; Kim, Kyoung-Nam
- Issue Date
- Oct-2017
- Publisher
- WILEY
- Keywords
- double-layered dual-tuned (DLDT) coil; magnetic resonance imaging (MRI); multinuclear; PIN diode
- Citation
- CONCEPTS IN MAGNETIC RESONANCE PART B-MAGNETIC RESONANCE ENGINEERING, v.47B, no.4
- Journal Title
- CONCEPTS IN MAGNETIC RESONANCE PART B-MAGNETIC RESONANCE ENGINEERING
- Volume
- 47B
- Number
- 4
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/5685
- DOI
- 10.1002/cmr.b.21363
- ISSN
- 1552-5031
- Abstract
- This article presents a dual-tuned (DT) radiofrequency (RF) coil for signal acquisition of 2 nuclei, namely, hydrogen (H-1) and sodium (Na-23), 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 H-1 and Na-23 coils being located on the outside and inside, respectively. The H-1 and Na-23 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 H-1 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 H-1 and Na-23 in the MRI system.
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