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@ARTICLE{Avdievich:168837,
      author       = {N. I. Avdievich and G. Solomakha and L. Ruhm and A. V.
                      Nikulin and A. Magill$^*$ and K. Scheffler},
      title        = {{F}olded-end dipole transceiver array for human whole-brain
                      imaging at 7 {T}.},
      journal      = {NMR in biomedicine},
      volume       = {12},
      issn         = {1099-1492},
      address      = {New York, NY},
      publisher    = {Wiley},
      reportid     = {DKFZ-2021-01088},
      pages        = {e4541},
      year         = {2021},
      note         = {2021 May 12;e4541},
      abstract     = {The advancement of clinical applications of ultrahigh field
                      (UHF) MRI depends heavily on advances in technology,
                      including the development of new radiofrequency (RF) coil
                      designs. Currently, the number of commercially available 7 T
                      head RF coils is rather limited, implying a need to develop
                      novel RF head coil designs that offer superior transmit and
                      receive performance. RF coils to be used for clinical
                      applications must be robust and reliable. In particular, for
                      transmit arrays, if a transmit channel fails the local
                      specific absorption rate may increase, significantly
                      increasing local tissue heating. Recently, dipole antennas
                      have been proposed and used to design UHF head transmit and
                      receive arrays. The dipole provides a unique simplicity
                      while offering comparable transmit efficiency and
                      signal-to-noise ratio with the conventional loop design.
                      Recently, we developed a novel array design in our
                      laboratory using a folded-end dipole antenna. In this work,
                      we developed, constructed and evaluated an eight-element
                      transceiver bent folded-end dipole array for human head
                      imaging at 7 T. Driven in the quadrature circularly
                      polarized mode, the array demonstrated more than $20\%$
                      higher transmit efficiency and significantly better
                      whole-brain coverage than that provided by a widely used
                      commercial array. In addition, we evaluated passive dipole
                      antennas for decoupling the proposed array. We demonstrated
                      that in contrast to the common unfolded dipole array, the
                      passive dipoles moved away from the sample not only minimize
                      coupling between the adjacent folded-end active dipoles but
                      also produce practically no destructive interference with
                      the quadrature mode of the array.},
      keywords     = {array optimization (Other) / decoupling (Other) /
                      folded-end dipole (Other) / human head imaging (Other) /
                      transceiver array (Other) / ultrahigh field MRI (Other)},
      cin          = {E020},
      ddc          = {610},
      cid          = {I:(DE-He78)E020-20160331},
      pnm          = {315 - Bildgebung und Radioonkologie (POF4-315)},
      pid          = {G:(DE-HGF)POF4-315},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:33978270},
      doi          = {10.1002/nbm.4541},
      url          = {https://inrepo02.dkfz.de/record/168837},
}