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@ARTICLE{Ko:861492,
      author       = {Ko, Yunkyoung and Choi, Chang-Hoon and Shah, N. J. and
                      Felder, Jorg},
      title        = {{S}ignal {L}oss {C}ompensation of {RF} {C}rossbar {S}witch
                      {M}atrix {S}ystem in {U}ltra-{H}igh {F}ield {MRI}},
      journal      = {IEEE transactions on biomedical circuits and systems},
      volume       = {12},
      number       = {6},
      issn         = {1940-9990},
      address      = {New York, NY},
      publisher    = {IEEE},
      reportid     = {FZJ-2019-01953},
      pages        = {1458 - 1466},
      year         = {2018},
      abstract     = {With the increased commercial availability of high channel
                      count MR coil arrays and the associated higher number of
                      plugs in the patient bed, it has become a common practice to
                      include switch matrices in the receive path of MR systems.
                      These allow the arbitrary routing of a signal from any plug
                      to any receiver in the console. While switch matrices are
                      standard in systems at clinical field strength and have been
                      developed for systems operating up to 4T, they have not yet
                      been implemented at ultra-high field (UHF). Here, we present
                      a switch matrix suitable for operation at UHF. Crossbar
                      switches, which are the most frequently employed forms of a
                      switch matrix, use RF switches to connect horizontal input
                      lines with the desired vertical output line. This leaves
                      transmission line stubs of variable length physically
                      connected with the selected signal path, potentially
                      resulting in elevated signal losses. While this can be
                      tolerated at low frequencies, and only needs partial
                      compensation at intermediate frequencies (4T), a full
                      compensation is required at UHF. In this study, an RF
                      crossbar switch, which uses switchable compensation elements
                      in both horizontal and vertical transmission lines, was
                      implemented for a 9.4T MRI scanner. The prototype developed
                      was evaluated for single channel and multichannel receive
                      performance and benchmarked against a fixed wire
                      connection.},
      cin          = {INM-4 / INM-11 / JARA-BRAIN},
      ddc          = {620},
      cid          = {I:(DE-Juel1)INM-4-20090406 / I:(DE-Juel1)INM-11-20170113 /
                      $I:(DE-82)080010_20140620$},
      pnm          = {573 - Neuroimaging (POF3-573)},
      pid          = {G:(DE-HGF)POF3-573},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:30235148},
      UT           = {WOS:000455190000026},
      doi          = {10.1109/TBCAS.2018.2871498},
      url          = {https://juser.fz-juelich.de/record/861492},
}