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@ARTICLE{Rietsch:142114,
      author       = {S. H. G. Rietsch and S. Orzada and S. Maderwald and S.
                      Brunheim and B. W. J. Philips and T. W. J. Scheenen and M.
                      Ladd$^*$ and H. H. Quick},
      title        = {7{T} ultra-high field body {MR} imaging with an 8-channel
                      transmit/32-channel receive radiofrequency coil array.},
      journal      = {Medical physics},
      volume       = {45},
      number       = {7},
      issn         = {2473-4209},
      address      = {College Park, Md.},
      publisher    = {AAPM},
      reportid     = {DKFZ-2018-02344},
      pages        = {2978 - 2990},
      year         = {2018},
      abstract     = {In this work, a combined body coil array with eight
                      transmit/receive (Tx/Rx) meander elements and with 24
                      receive-only (Rx) loops (8Tx/32Rx) was developed and
                      evaluated in comparison with an 8-channel transmit/receive
                      body array (8Tx/Rx) based on meander elements serving as the
                      reference standard.Systematic evaluation of the RF array was
                      performed on a body-sized phantom. Body imaging at 7T was
                      performed in six volunteers in the body regions pelvis,
                      abdomen, and heart. Coil characteristics such as
                      signal-to-noise ratio, acceleration capability, g-factors,
                      S-parameters, noise correlation, and B1+ maps were assessed.
                      Safety was ensured by numerical simulations using a coil
                      model validated by dosimetric field measurements.Meander
                      elements and loops are intrinsically well decoupled with a
                      maximum coupling value of -20.5 dB. Safe use of the
                      8Tx/32Rx array could be demonstrated. High gain in
                      signal-to-noise ratio $(33\%$ in the subject's center) could
                      be shown for the 8Tx/32Rx array compared to the 8Tx/Rx
                      array. Improvement in acceleration capability in all
                      investigations could be demonstrated. For example, the
                      8Tx/32Rx array provides lower g-factors in the right-left
                      and anterior-posterior directions with R = 3 undersampling
                      as compared to the 8Tx/Rx array using R = 2. Both arrays
                      are very similar regarding their RF transmit performance.
                      Excellent image quality in the investigated body regions
                      could be achieved with the 8Tx/32Rx array.In this work, we
                      show that a combination of eight meander elements and 24
                      loop receive elements is possible without impeding transmit
                      performance. Improved SNR and g-factor performance compared
                      to an RF array without these loops is demonstrated. Body MRI
                      at 7T with the 8Tx/32Rx array could be accomplished in the
                      heart, abdomen, and pelvis with excellent image quality.},
      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:29679498},
      doi          = {10.1002/mp.12931},
      url          = {https://inrepo02.dkfz.de/record/142114},
}