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@ARTICLE{Obriot:282540,
      author       = {Obriot, Joseph and Mauconduit, Franck and Gras, Vincent and
                      Giliyar Radhakrishna, Chaithya and Bertrait, Maxime and
                      Ehses, Philipp and Stirnberg, Rüdiger and Le Ster, Caroline
                      and Boulant, Nicolas},
      title        = {{O}n the {I}mpact of {A}rtifacts {I}nduced by {M}ismatches
                      {B}etween {A}uto‐{C}alibration {S}ignal and {A}ccelerated
                      3{D} {GRE} {D}ata at 11.7{T}},
      journal      = {Magnetic resonance in medicine},
      volume       = {AOP},
      issn         = {1522-2594},
      address      = {New York, NY [u.a.]},
      publisher    = {Wiley-Liss},
      reportid     = {DZNE-2025-01303},
      pages        = {mrm.70127},
      year         = {2025},
      abstract     = {PurposeThe study aims at investigating field inhomogeneity
                      artifacts arising from remote locations in the FOV and
                      encountered in accelerated 3D gradient-recalled echo (GRE)
                      sequences at ultra-high field, and at providing mitigation
                      strategies.MethodsMeasurements were conducted at 11.7T using
                      a head-shaped phantom and an accelerated 3D GRE sequence
                      with either integrated or external auto-calibration signal
                      (ACS) lines. Simulations were performed to reproduce the
                      artifacts. The effects of varying GRAPPA reconstruction
                      parameters (kernel size and regularization) were also
                      examined.Results field inhomogeneities located outside the
                      shimmed region of interest (i.e., the brain) were observed
                      to return ripple-like artifacts within this region,
                      particularly at long echo times. The simulation results
                      support these findings, and the idea that the observed
                      artifact originates from a mismatch between ACS and
                      accelerated data due to intra-voxel dephasing at different
                      resolutions (ACS lines having an intrinsically lower
                      resolution). The short echo time enabled by external (i.e.,
                      preacquired) ACS lines reduced artifacts compared to
                      integrated ones. Varying GRAPPA kernel sizes and increasing
                      the number of ACS lines can improve image quality, yet
                      without full compensation.ConclusionThis study highlights
                      ripple-like artifacts amplified with field strength and
                      arising from a lack of coherence between the ACS and imaging
                      (3D GRE) signal caused by intra-voxel dephasing. To minimize
                      these artifacts, care should be taken in order to preserve
                      the relevant information in the ACS data to properly compute
                      the GRAPPA kernels.},
      cin          = {AG Stöcker / AG Reuter},
      ddc          = {610},
      cid          = {I:(DE-2719)1013026 / I:(DE-2719)1040310},
      pnm          = {354 - Disease Prevention and Healthy Aging (POF4-354)},
      pid          = {G:(DE-HGF)POF4-354},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1002/mrm.70127},
      url          = {https://pub.dzne.de/record/282540},
}