% 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{Ruck:299842,
      author       = {L. Ruck and N. Egger and T. Wilferth and J. Schirmer and L.
                      V. Gast and S. Nagelstraßer and S. Wildenberg and A. Bitz
                      and T. Lanz and T. Platt$^*$ and S. Konstandin and C. Kopp
                      and M. Uder and A. Nagel$^*$},
      title        = {{I}nterleaved 23{N}a/1{H} {MRI} of the human heart at 7 {T}
                      using a combined 23{N}a/1{H} coil setup and 1{H} parallel
                      transmission.},
      journal      = {Magnetic resonance in medicine},
      volume       = {94},
      number       = {1},
      issn         = {1522-2594},
      address      = {New York, NY [u.a.]},
      publisher    = {Wiley-Liss},
      reportid     = {DKFZ-2025-00579},
      pages        = {231-241},
      year         = {2025},
      note         = {#LA:E020# / Volume 94, Issue 1, July 2025, Pages 231-241},
      abstract     = {To evaluate the feasibility of interleaved 23Na/1H cardiac
                      MRI at 7 T using 1H parallel transmission (pTx) pulses.A
                      combined setup consisting of a 23Na volume coil and two 1H
                      transceiver arrays was employed and the transmit and receive
                      characteristics were compared in vitro with those of the
                      uncombined radiofrequency coils. Furthermore, the
                      implemented interleaved 23Na/1H pTx sequence was validated
                      in phantom measurements and applied to four healthy
                      subjects. For the latter, three customized 1H excitation
                      pulses (universal and individual phase shims (UPS/IPS) and
                      individual 4kT pulses (4kT)) were employed in the
                      interleaved 23Na/1H pTx sequence and compared with the
                      vendor-provided default cardiac phase shim (DPS).Combining
                      both coils resulted in a reduction of the mean 23Na transmit
                      field (B1 +) efficiency and 23Na signal-to-noise ratio by
                      $18.9\%$ and $15.4\%$ for the combined setup, whereas the 1H
                      B1 + efficiency was less influenced $(-4.7\%).$ Compared
                      with single-nuclear acquisitions, interleaved dual-nuclear
                      23Na/1H MRI showed negligible influence on 23Na and 1H image
                      quality. For all three customized 1H pTx pulses the B1 +
                      homogeneity was improved (coefficients of variation: CVUPS =
                      0.30, CVIPS = 0.23, CV4kT = 0.15) and no 1H signal dropouts
                      occurred compared with the vendor-provided default phase
                      shim (CVDPS = 0.37).The incorporation of customized 1H pTx
                      pulses in an interleaved 23Na/1H sequence scheme was
                      successfully demonstrated at 7 T and improvements of the 1H
                      B1 + homogeneity within the heart were shown. Combining
                      interleaved 23Na/1H MRI with 1H pTx is an important tool to
                      enable robust quantification of myocardial tissue sodium
                      concentrations at 7 T within clinically acceptable
                      acquisition times.},
      keywords     = {23Na RF birdcage coil (Other) / 7 Tesla (Other) / cardiac
                      sodium (23Na) MRI (Other) / interleaved acquisition (Other)
                      / parallel transmission (pTx) (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:40065602},
      doi          = {10.1002/mrm.30426},
      url          = {https://inrepo02.dkfz.de/record/299842},
}