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@ARTICLE{Aigner:290172,
      author       = {C. S. Aigner and M. F. Sánchez Alarcon and A. D'Astous and
                      E. Alonso-Ortiz and J. Cohen-Adad$^*$ and S. Schmitter$^*$},
      title        = {{C}alibration-free parallel transmission of the cervical,
                      thoracic, and lumbar spinal cord at 7{T}.},
      journal      = {Magnetic resonance in medicine},
      volume       = {92},
      number       = {4},
      issn         = {1522-2594},
      address      = {New York, NY [u.a.]},
      publisher    = {Wiley-Liss},
      reportid     = {DKFZ-2024-01008},
      pages        = {1496-1510},
      year         = {2024},
      note         = {#LA:E020# / 2024 Oct;92(4):1496-1510},
      abstract     = {To address the limitations of spinal cord imaging at
                      ultra-high field (UHF) due to time-consuming parallel
                      transmit (pTx) adjustments. This study introduces
                      calibration-free offline computed universal shim modes that
                      can be applied seamlessly for different pTx RF coils and
                      spinal cord target regions, substantially enhancing spinal
                      cord imaging efficiency at UHF.A library of channel-wise
                      relative B 1 + $$ {B}_1^{+} $$ maps for the cervical spinal
                      cord (six datasets) and thoracic and lumbar spinal cord
                      (nine datasets) was constructed to optimize transmit
                      homogeneity and efficiency for these regions. A tailored B0
                      shim was optimized for the cervical spine to enhance spatial
                      magnetic field homogeneity further. The performance of the
                      universal shims was validated using absolute saturation
                      based B 1 + $$ {B}_1^{+} $$ mapping and high-resolution 2D
                      and 3D multi-echo gradient-recalled echo (GRE) data to
                      assess the image quality.The proposed universal shims
                      demonstrated a 50\% improvement in B 1 + $$ {B}_1^{+} $$
                      efficiency compared to the default (zero phase) shim mode. B
                      1 + $$ {B}_1^{+} $$ homogeneity was also improved by 20\%.
                      The optimized universal shims achieved performance
                      comparable to subject-specific pTx adjustments, while
                      eliminating the need for lengthy pTx calibration times,
                      saving about 10 min per experiment.The development of
                      universal shims represents a significant advance by
                      eliminating time-consuming subject-specific pTx adjustments.
                      This approach is expected to make UHF spinal cord imaging
                      more accessible and user-friendly, particularly for non-pTx
                      experts.},
      keywords     = {7 Tesla (Other) / calibration‐free (Other) / parallel
                      transmission (Other) / spinal cord (Other) / universal pulse
                      (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:38733068},
      doi          = {10.1002/mrm.30137},
      url          = {https://inrepo02.dkfz.de/record/290172},
}