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@ARTICLE{Ha:841866,
      author       = {Ha, YongHyun and Choi, Chang-Hoon and Worthoff, Wieland and
                      Shymanskaya, Aliaksandra and Schöneck, Michael and
                      Willuweit, Antje and Felder, Jörg and Shah, N. J.},
      title        = {{D}esign and use of a folded four-ring double-tuned
                      birdcage coil for rat brain sodium imaging at 9.4 {T}},
      journal      = {Journal of magnetic resonance},
      volume       = {286},
      issn         = {1090-7807},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2018-00163},
      pages        = {110 - 114},
      year         = {2018},
      abstract     = {A folded four-ring quadrature birdcage coil was designed
                      and constructed with a double-tune configuration of an outer
                      high-pass coil for 1H (400 MHz) and inner low-pass coil
                      for 23Na (105.72 MHz at 9.4 T). The coil was evaluated
                      on the bench and in the scanner, comparing its performance
                      with that of single-tuned coils and a large four-ring coil.
                      All coils were tuned and matched and the isolation between
                      two quadrature ports was found to be better than
                      −13.7 dB for 1H and −27 dB for 23Na. Signal-to-noise
                      ratios (SNRs) were calculated and 23Na flip angle maps were
                      acquired. 23Na SNR of the folded four-ring reached $∼93\%$
                      of that obtained with the single-tuned coil. A set of in
                      vivo1H and 23Na axial images to cover the whole rat brain
                      were obtained. The performance of the folded four-ring coil
                      and its benefit for 23Na imaging experiments have been
                      demonstrated. This proposed four-ring coil could avoid
                      length restrictions, e.g. the shoulders, by folding the
                      outer rings vertically. This facilitates the construction of
                      double-tuned four-ring birdcage coils just to fit the head,
                      leading to higher filling factors and better SNR.},
      cin          = {INM-4 / JARA-BRAIN / INM-11},
      ddc          = {550},
      cid          = {I:(DE-Juel1)INM-4-20090406 / $I:(DE-82)080010_20140620$ /
                      I:(DE-Juel1)INM-11-20170113},
      pnm          = {573 - Neuroimaging (POF3-573)},
      pid          = {G:(DE-HGF)POF3-573},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:29227914},
      UT           = {WOS:000424071300015},
      doi          = {10.1016/j.jmr.2017.12.003},
      url          = {https://juser.fz-juelich.de/record/841866},
}