The state-of-the-art and emerging design approaches of double-tuned RF coils for X-nuclei, brain MR imaging and spectroscopy: A review

Choi, C.; Hong, Seok-In; Felder, Jörg; Shah, N. Jon

doi:10.1016/j.mri.2020.07.003

Cited by 38 publications

(43 citation statements)

References 133 publications

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“…Similar to results previously presented for optimising double-tuned coil designs [12], we anticipate a trade-off, in terms of degree of SNR loss in one resonance against smaller losses in the other, will be encountered in most cases. Although the dual-frequency matching networks can enable a good matching condition by recuperating the impedance mismatch at both frequencies, it can also further engender a level of additional sensitivity degradation.…”

Section: Introductionsupporting

confidence: 73%

“…Matching networks They were double tuned to 1 H and 23 Na frequencies (corresponding to 297.2 MHz and 78.5 MHz at 7 T, respectively) using conventional trap circuits without inserting any matching network. By adding the LC trap(s) in the coil, it is typically possible for the single-structure coil to allow multiple resonances [12,17,18] by either blocking a particular frequency or splitting one to two or more frequencies. In order to ensure that the quality of the four double-tuned coils was indistinguishable, we measured the quality (Q) factors of the base coils on the bench using a double-sniffer loop [22] and a network analyser prior to adding any matching network.…”

Section: +18 Pfmentioning

confidence: 99%

“…Nevertheless, designing a coil that performs well in this context is challenging, even when it is only required to generate one additional frequency. Double tuning coils requires additional units, and this is usually achieved using various techniques, e.g., using frequency-splitting or -blocking traps or using PIN-diode switches [12][13][14][15][16]. The effect of the attached circuits, required for double tuning, on coil sensitivity has been previously reported and has always resulted in a decreased SNR compared to their referenced single-tuned coils [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Design and Comparison of Different Types of Dual-Frequency Matching Networks Used in Double-Tuned Coils for Multinuclear Magnetic Resonance Imaging and Spectroscopy

et al. 2022

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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 ( 1 H) and sodium-23 ( 23 Na) 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 1 H or the 23 Na 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 1 H SNR decreased significantly due to the inserted traps, whereas the SNRs of the 23 Na 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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Section: Introductionsupporting

confidence: 73%

Section: +18 Pfmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design and Comparison of Different Types of Dual-Frequency Matching Networks Used in Double-Tuned Coils for Multinuclear Magnetic Resonance Imaging and Spectroscopy

et al. 2022

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“…37,60,[112][113][114][115][116][117][118][119][120][121][122] An in-depth discussion on the trade-offs for single-and multi-structure dual-tuned RF coils designs (focused on the brain but applicable to other anatomical targets) can be found elsewhere. 123…”

Section: Rf Coilsmentioning

confidence: 99%

Interleaved and simultaneous multi‐nuclear magnetic resonance in vivo. Review of principles, applications and potential

et al. 2022

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Magnetic resonance signals from different nuclei can be excited or received at the same time,rendering simultaneous or rapidly interleaved multi‐nuclear acquisitions feasible. The advan‐tages are a reduction of total scan time compared to sequential multi‐nuclear acquisitions or that additional information from heteronuclear data is obtained at thesame time and anatomical position. Information content can be qualitatively increased by delivering a more comprehensive MR‐based picture of a transient state (such as an exercise bout). Also, combiningnon‐proton MR acquisitions with 1Hinformation (e.g., dynamic shim updates and motion correction) can be used to improve data quality during long scans and benefits image coregistration. This work reviews the literature on interleaved and simultaneous multi‐nuclear MRI and MRS in vivo. Prominent use cases for this methodology in clinical and research applications are brain and muscle, but studies have also been carried out in other targets, including the lung, knee, breast and heart. Simultaneous multi‐nuclear measurements in the liver and kidney have also been performed, but exclusively in rodents. In this review, a consistent nomenclature is proposed, to help clarify the terminology used for this principle throughout the literature on in‐vivo MR. An overview covers the basic principles, the technical requirements on the MR scanner and the implementations realised either by MR system vendors or research groups, from the early days until today. Considerations regarding the multi‐tuned RF coils required and heteronuclear polarisation interactions are briefly discussed, and fields for future in‐vivo applications for interleaved multi‐nuclear MR pulse sequences are identified.

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“…The benefits of the discussed tuning strategies along with others can be found in the work presented by Choi [75], but the specific choice of strategy for X-nuclei arrays is largely dependent on the specific application,. The next sections more fully explore past and current applications of these array coil designs for specific nuclei ( 31 P, 13 C, 23 Na, and 19 F) while providing an overview of some of the unique information available from each of these nuclei.…”

Section: Rf Array Coilsmentioning

confidence: 99%

A Review of Non-¹H RF Receive Arrays in Magnetic Resonance Imaging and Spectroscopy

Wilcox

Wright

McDougall

2020

IEEE Open J. Eng. Med. Biol.

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It is now common practice to use radiofrequency (RF) array coils to increase the signal-to-noise ratio (SNR) in 1 H magnetic resonance imaging and spectroscopy experiments. Use of array coils for non-1 H experiments, however, has been historically more limited despite the fact that these nuclei suffer inherently lower sensitivity and could benefit greatly from an increased SNR. Recent advancements in receiver technology and increased support from scanner manufacturers have now opened greater options for the use of array coils for non-1 H magnetic resonance experiments. This paper reviews the research in adopting array coil technology with an emphasis on studies of the most commonly studied non-1 H nuclei including 31 P, 13 C, 23 Na, and 19 F. These nuclei offer complementary information to 1 H imaging and spectroscopy and have proven themselves important in the study of numerous disease processes. While recent work with non-1 H array coils has shown promising results, the technology is not yet widely utilized and should see substantial developments in the coming years.

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The state-of-the-art and emerging design approaches of double-tuned RF coils for X-nuclei, brain MR imaging and spectroscopy: A review

Cited by 38 publications

References 133 publications

Design and Comparison of Different Types of Dual-Frequency Matching Networks Used in Double-Tuned Coils for Multinuclear Magnetic Resonance Imaging and Spectroscopy

Design and Comparison of Different Types of Dual-Frequency Matching Networks Used in Double-Tuned Coils for Multinuclear Magnetic Resonance Imaging and Spectroscopy

Interleaved and simultaneous multi‐nuclear magnetic resonance in vivo. Review of principles, applications and potential

A Review of Non-¹H RF Receive Arrays in Magnetic Resonance Imaging and Spectroscopy

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The state-of-the-art and emerging design approaches of double-tuned RF coils for X-nuclei, brain MR imaging and spectroscopy: A review

Cited by 38 publications

References 133 publications

Design and Comparison of Different Types of Dual-Frequency Matching Networks Used in Double-Tuned Coils for Multinuclear Magnetic Resonance Imaging and Spectroscopy

Design and Comparison of Different Types of Dual-Frequency Matching Networks Used in Double-Tuned Coils for Multinuclear Magnetic Resonance Imaging and Spectroscopy

Interleaved and simultaneous multi‐nuclear magnetic resonance in vivo. Review of principles, applications and potential

A Review of Non-1H RF Receive Arrays in Magnetic Resonance Imaging and Spectroscopy

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A Review of Non-¹H RF Receive Arrays in Magnetic Resonance Imaging and Spectroscopy