% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Felder:878486,
      author       = {Felder, Jörg and Choi, Chang-Hoon and Ko, Yunkyoung and
                      Shah, N. Jon},
      title        = {{O}ptimization of high-channel count, switch matrices for
                      multinuclear, high-field {MRI}},
      journal      = {PLOS ONE},
      volume       = {15},
      number       = {8},
      issn         = {1932-6203},
      address      = {San Francisco, California, US},
      publisher    = {PLOS},
      reportid     = {FZJ-2020-02875},
      pages        = {e0237494 -},
      year         = {2020},
      abstract     = {Modern magnetic resonance imaging systems are equipped with
                      a large number of receive connectors in order to optimally
                      support a large field-of-view and/or high acceleration in
                      parallel imaging using high-channel count, phased array
                      coils. Given that the MR system is equipped with a limited
                      number of digitizing receivers and in order to support
                      operation of multinuclear coil arrays, these connectors need
                      to be flexibly routed to the receiver outside the RF
                      shielded examination room. However, for a number of
                      practical, economic and safety reasons, it is better to only
                      route a subset of the connectors. This is usually
                      accomplished with the use of switch matrices. These exist in
                      a variety of topologies and differ in routing flexibility
                      and technological implementation. A highly flexible
                      implementation is a crossbar topology that allows to any one
                      input to be routed to any one output and can use single PIN
                      diodes as active elements. However, in this configuration,
                      long open-ended transmission lines can potentially remain
                      connected to the signal path leading to high transmission
                      losses. Thus, especially for high-field systems compensation
                      mechanisms are required to remove the effects of open-ended
                      transmission line stubs. The selection of a limited number
                      of lumped element reactance values to compensate for the for
                      the effect of transmission line stubs in large-scale switch
                      matrices capable of supporting multi-nuclear operation is
                      non-trivial and is a combinatorial problem of high order.
                      Here, we demonstrate the use of metaheuristic approaches to
                      optimize the circuit design of these matrices that
                      additionally carry out the optimization of distances between
                      the parallel transmission lines. For a matrix with 128
                      inputs and 64 outputs a realization is proposed that
                      displays a worst-case insertion loss of 3.8 dB.},
      cin          = {INM-4 / INM-11 / JARA-BRAIN},
      ddc          = {610},
      cid          = {I:(DE-Juel1)INM-4-20090406 / I:(DE-Juel1)INM-11-20170113 /
                      I:(DE-Juel1)VDB1046},
      pnm          = {573 - Neuroimaging (POF3-573)},
      pid          = {G:(DE-HGF)POF3-573},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:32804972},
      UT           = {WOS:000563517800024},
      doi          = {10.1371/journal.pone.0237494},
      url          = {https://juser.fz-juelich.de/record/878486},
}