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| 100 | 1 | _ | |a Choi, Chang-Hoon |0 P:(DE-Juel1)164356 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Design and comparison of different types of dual-frequency matching networks used in double-tuned coils for multinuclear magnetic resonance imaging and spectroscopy |
| 260 | _ | _ | |a New York, NY |c 2022 |b IEEE |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a Multi-resonant RF coils are often used in multinuclear MR imaging and/or spectroscopy experiments, and a large variety of strategies for multi-tuning coils exist. However, designing a multi-tuned coil with good performance is challenging, and improvements in sensitivity are always desirable - particularly on the X-nucleus coil due to the intrinsically lower MR sensitivity of non-proton nuclei. In this work, various dual-frequency matching networks in double-tuned coils are compared, and their effect on the coil performance is investigated. Four different dual-frequency matching networks were designed and constructed with frequency-splitting or -blocking traps, which enable exploration of both proton-1 (1H) and sodium-23 (23Na) nuclei. Two single-frequency matching networks were also built without any additional lossy components as a reference, and their matchings were set to either the 1H or the 23Na frequency. The initial evaluation was conducted on the bench using a network analyser to examine the scattering (S)-parameters and quality factors of the connected RF coils. The performance of the attached matching networks was then further evaluated by measuring the corresponding signal-to-noise ratio (SNR) based on images obtained at a 7 T clinical MRI scanner. It was found that even though the tuning and matching conditions were nearly impeccable in the S-parameters, the actual 1H SNR decreased significantly due to the inserted traps, whereas the SNRs of the 23Na frequency were nearly maintained with the added traps and the losses were much less. The dual-frequency matching networks create additional sensitivity loss, which is dependent on the actual implementation of the matching circuit. This is in agreement with previously reported results associated with the evaluation of inserted double-tuning traps for RF coils. |
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| 588 | _ | _ | |a Dataset connected to CrossRef, Journals: juser.fz-juelich.de |
| 700 | 1 | _ | |a Hong, Suk-Min |0 P:(DE-Juel1)164150 |b 1 |
| 700 | 1 | _ | |a Shah, N. J. |0 P:(DE-Juel1)131794 |b 2 |u fzj |
| 700 | 1 | _ | |a Felder, Jorg |0 P:(DE-Juel1)131761 |b 3 |
| 773 | _ | _ | |a 10.1109/ACCESS.2022.3223731 |g p. 1 - 1 |0 PERI:(DE-600)2687964-5 |p 123899 - 123904 |t IEEE access |v 10 |y 2022 |x 2169-3536 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/911657/files/Design_and_Comparison_of_Different_Types_of_Dual-Frequency_Matching_Networks_Used_in_Double-Tuned_Coils_for_Multinuclear_Magnetic_Resonance_Imaging_and_Spectroscopy.pdf |y OpenAccess |
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