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@ARTICLE{Noureddine:131732,
      author       = {Y. Noureddine and O. Kraff and M. Ladd$^*$ and K. H. Wrede
                      and B. Chen and H. H. Quick and G. Schaefers and A.
                      Bitz$^*$},
      title        = {{I}n vitro and in silico assessment of {RF}-induced heating
                      around intracranial aneurysm clips at 7 {T}esla.},
      journal      = {Magnetic resonance in medicine},
      volume       = {79},
      number       = {1},
      issn         = {0740-3194},
      address      = {New York, NY [u.a.]},
      publisher    = {Wiley-Liss},
      reportid     = {DKFZ-2018-00038},
      pages        = {568 - 581},
      year         = {2018},
      abstract     = {To examine radiofrequency-induced tissue heating around
                      intracranial aneurysm clips during a 7 Tesla (T) head MR
                      examination.Radiofrequency (RF), temperature simulations,
                      and RF measurements were employed to investigate the effects
                      of polarization and clip length on the electric field
                      (E-field) and temperature. Heating in body models was
                      studied using both a conservative approach and realistic
                      exposure scenarios.Worst-case orientation was found for
                      clips aligned parallel to the E-field polarization. Absolute
                      tissue temperature remained below International
                      Electrotechnical Commission regulatory limits for 44 of 50
                      clinical scenarios. No significant effect on heating was
                      determined for clip lengths below 18.8 mm, and worst-case
                      heating was found for clip length 51.5 mm. The
                      conservative approach led to a maximum permissible E-field
                      of 72 V/m corresponding to B1+ of 1.2 µT, and an
                      accepted power of 4.6 W for the considered RF head coil
                      instead of 38.5 W without clip.Safe scanning conditions with
                      respect to RF-induced heating can be applied depending on
                      the information about the clip gained during screening
                      interviews. However, force and torque measurements in the MR
                      system shall be conducted to give a final statement on the
                      MR safety of aneurysm clips at 7T. Magn Reson Med
                      79:568-581, 2018. © 2017 International Society for Magnetic
                      Resonance in Medicine.},
      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:28266079},
      doi          = {10.1002/mrm.26650},
      url          = {https://inrepo02.dkfz.de/record/131732},
}