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@ARTICLE{Choi:911657,
      author       = {Choi, Chang-Hoon and Hong, Suk-Min and Shah, N. J. and
                      Felder, Jorg},
      title        = {{D}esign and comparison of different types of
                      dual-frequency matching networks used in double-tuned coils
                      for multinuclear magnetic resonance imaging and
                      spectroscopy},
      journal      = {IEEE access},
      volume       = {10},
      issn         = {2169-3536},
      address      = {New York, NY},
      publisher    = {IEEE},
      reportid     = {FZJ-2022-04912},
      pages        = {123899 - 123904},
      year         = {2022},
      abstract     = {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.},
      cin          = {INM-4 / INM-11 / JARA-BRAIN},
      ddc          = {621.3},
      cid          = {I:(DE-Juel1)INM-4-20090406 / I:(DE-Juel1)INM-11-20170113 /
                      I:(DE-Juel1)VDB1046},
      pnm          = {5253 - Neuroimaging (POF4-525)},
      pid          = {G:(DE-HGF)POF4-5253},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000912647300001},
      doi          = {10.1109/ACCESS.2022.3223731},
      url          = {https://juser.fz-juelich.de/record/911657},
}