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@ARTICLE{Fiedler:293575,
      author       = {T. Fiedler$^*$ and M. E. Ladd$^*$ and S. Orzada$^*$},
      title        = {{L}ocal and whole-body {SAR} in {UHF} body imaging:
                      {I}mplications for {SAR} matrix compression.},
      journal      = {Magnetic resonance in medicine},
      volume       = {93},
      number       = {2},
      issn         = {1522-2594},
      address      = {New York, NY [u.a.]},
      publisher    = {Wiley-Liss},
      reportid     = {DKFZ-2024-01898},
      pages        = {842-849},
      year         = {2025},
      note         = {#EA:E020#LA:E020# / 2025 Feb;93(2):842-849},
      abstract     = {Transmit arrays for body imaging have characteristics of
                      both volume and local transmit coils. This study evaluates
                      two specific absorption rate (SAR) aspects, local and
                      whole-body SAR, of arrays for body imaging at 7 T and also
                      for a 3 T birdcage.Simulations were performed for six
                      antenna arrays at 7 T and one 3 T birdcage. Local SAR
                      matrices and the whole-body SAR matrix were computed and
                      evaluated with random shims. A set of reduced local SAR
                      matrices was determined by removing all matrices dominated
                      by the whole-body SAR matrix.The results indicate that all
                      RF transmit coils for body imaging in this study are
                      constrained by the local SAR limit. The ratio between local
                      and whole-body SAR is nevertheless smaller for arrays with
                      large FOV, as these arrays also expose a larger part of the
                      human body. By using the whole-body SAR matrix, the number
                      of local SAR matrices can be reduced (e.g., $33.3\%$
                      matrices remained for an 8-channel local array and $89.7\%$
                      for a 30-channel remote array; $12.1\%$ for the 3 T
                      birdcage).For transmit antenna arrays used for body imaging
                      at 7 T as well as for the 3 T birdcage, all evaluated cases
                      show that the local SAR limit was reached before reaching
                      the whole-body SAR limit. Nevertheless, the whole-body SAR
                      matrix can be used to reduce the number of local SAR
                      matrices, which is important to reduce memory and computing
                      time for a virtual observation points (VOP) compression.
                      This step can be included as a pre-compression prior to a
                      VOP compression.},
      keywords     = {UHF body imaging (Other) / VOPs (Other) / local SAR (Other)
                      / whole‐body SAR (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:39301784},
      doi          = {10.1002/mrm.30306},
      url          = {https://inrepo02.dkfz.de/record/293575},
}