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@ARTICLE{Brunheim:132460,
      author       = {S. Brunheim and M. Gratz and S. Johst and A. Bitz$^*$ and
                      T. Fiedler$^*$ and M. Ladd$^*$ and H. H. Quick and S.
                      Orzada},
      title        = {{F}ast and accurate multi-channel {B}1+ mapping based on
                      the {TIAMO} technique for 7{T} {UHF} body {MRI}.},
      journal      = {Magnetic resonance in medicine},
      volume       = {79},
      number       = {5},
      issn         = {0740-3194},
      address      = {New York, NY [u.a.]},
      publisher    = {Wiley-Liss},
      reportid     = {DKFZ-2018-00148},
      pages        = {2652 - 2664},
      year         = {2018},
      abstract     = {Current methods for mitigation of transmit field B1+
                      inhomogeneities at ultrahigh field (UHF) MRI by
                      multi-channel radiofrequency (RF) shimming rely on accurate
                      B1+ mapping. This can be time consuming when many RF
                      channels have to be mapped for in vivo body MRI, where the
                      B1maps should ideally be acquired within a single
                      breath-hold. Therefore, a new B1+ mapping technique
                      (B1TIAMO) is proposed.The performance of this technique is
                      validated against an established method (DREAM) in phantom
                      measurements for a cylindrical head phantom with an
                      8-channel transmit/receive (Tx/Rx) array. Furthermore,
                      measurements for a 32-channel Tx/Rx remote array are
                      conducted in a large body phantom and the |B1+| map
                      reliability is validated against simulations of the transmit
                      RF field distribution. Finally, in vivo results of this new
                      mapping technique for human abdomen are presented.For the
                      head phantom (8-channel Tx/Rx coil), the single |B1+|
                      comparison between B1TIAMO, the direct DREAM measurements,
                      and simulation data showed good agreement with $10-19\%$
                      difference. For the large body phantom (32-channel Tx/Rx
                      coil), B1TIAMO matched the RF field simulations well.The
                      results demonstrate the potential to acquire 32 accurate
                      single-channel B1+ maps for large field-of-view body imaging
                      within only a single breath-hold of 16 s at 7T UHF MRI. Magn
                      Reson Med 79:2652-2664, 2018. © 2017 International Society
                      for Magnetic Resonance in Medicine.},
      cin          = {E020},
      ddc          = {610},
      cid          = {I:(DE-He78)E020-20160331},
      pnm          = {315 - Imaging and radiooncology (POF3-315)},
      pid          = {G:(DE-HGF)POF3-315},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:28994132},
      doi          = {10.1002/mrm.26925},
      url          = {https://inrepo02.dkfz.de/record/132460},
}