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Research ArticleHead and Neck Imaging

MSVAT-SPACE-STIR and SEMAC-STIR for Reduction of Metallic Artifacts in 3T Head and Neck MRI

T. Hilgenfeld, M. Prager, F.S. Schwindling, M. Nittka, P. Rammelsberg, M. Bendszus, S. Heiland and A. Juerchott
American Journal of Neuroradiology May 2018, DOI: https://doi.org/10.3174/ajnr.A5678
T. Hilgenfeld
aFrom the Department of Neuroradiology, (T.H., M.P., M.B., S.H., A.J.)
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  • ORCID record for T. Hilgenfeld
M. Prager
aFrom the Department of Neuroradiology, (T.H., M.P., M.B., S.H., A.J.)
bSection of Experimental Radiology (M.P., S.H.), University of Heidelberg, Heidelberg, Germany
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F.S. Schwindling
cDepartment of Prosthodontics (F.S.S., P.R.), Heidelberg University Hospital, Heidelberg, Germany
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M. Nittka
dSiemens Healthcare (M.N.), Erlangen, Germany.
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P. Rammelsberg
cDepartment of Prosthodontics (F.S.S., P.R.), Heidelberg University Hospital, Heidelberg, Germany
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M. Bendszus
aFrom the Department of Neuroradiology, (T.H., M.P., M.B., S.H., A.J.)
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S. Heiland
aFrom the Department of Neuroradiology, (T.H., M.P., M.B., S.H., A.J.)
bSection of Experimental Radiology (M.P., S.H.), University of Heidelberg, Heidelberg, Germany
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A. Juerchott
aFrom the Department of Neuroradiology, (T.H., M.P., M.B., S.H., A.J.)
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  • Fig 1.
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    Fig 1.

    Artifact volumes (signal loss and pileup artifacts) of all sequences caused by the CCT-T (A) and the Z-T (B) samples (double asterisks indicate P ≤ .001; numbers next to the bars indicate the volume of pileup and signal loss artifacts separately in milliliters). n.s. indicates not significant.

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    Fig 2.

    3D rendering of artifacts and source images (blue, signal loss artifacts; red, pileup artifacts) of the CCT-T (A) samples and Z-T (B) samples for all evaluated sequences.

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    Fig 3.

    Comparison of all 4 STIR sequences in 2 volunteers with metallic dental materials. A, A patient with artifacts caused by a retainer (signal-loss artifact within dashed lines). B, A volunteer with artifacts caused by an amalgam filling. Note the decrease of artifact sizes in MSVAT-SPACE-STIR images compared with SPACE-STIR images in both examples. Minor differences can be noted between TSE-STIR and SEMAC-STIR images, as well.

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    Fig 4.

    nSNR values of all used sequences. Double asterisks indicate P ≤ .001). n.s. indicates not significant.

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    Fig 5.

    Mean visibility scores of in vitro images of the 8 anatomic structures in all STIR sequences. The asterisk indicates P ≤ .05; double asterisks, P ≤ .001.

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    Fig 6.

    Two patients examined with MSVAT-SPACE-STIR. A, A 25-year-old woman with dysesthesia in the right mandible and chin after wisdom tooth extraction in the right mandible (asterisk indicates the extraction site). Increased signal intensity of the neurovascular bundle (white solid arrow) compared with the healthy side (white dashed arrow) in curved multiplane reconstructions of MSVAT-SPACE-STIR, suggesting nerve damage. Note the small amount of artifacts around the implant-supported crown (hash tag) and incomplete bone marrow conversion resulting in bright signal in STIR images on both sides (double asterisks). B, An 8-year-old child after drainage of an abscess in the right mandible with residual soft-tissue inflammation in the right lateral gingiva (white arrows in reformatted axial [left]) and coronal [right]) images).

Tables

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  • Parameters of all sequences

    SequenceTR/TE (ms)Voxel Size (mm)FOV (mm)MatrixReadout Bandwidth (Hz/Px)SlicesSlice-Encoding Steps or Oversampling (%)VATTime (min:sec)
    SPACE-STIR2500/1310.55 × 0.55 × 0.55140 × 1242565017255.6No14:02
    MSVAT-SPACE-STIR2500/1990.55 × 0.55 × 0.55140 × 842565287255.6Yes06:04
    TSE-STIR5100/440.59 × 0.59 × 1.5150 × 15025659225NoNo03:36
    SEMAC-STIR5100/450.59 × 0.59 × 1.5150 × 150256592254Yes06:19
    • Note:—VAT indicates view angle tilting.

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Cite this article
T. Hilgenfeld, M. Prager, F.S. Schwindling, M. Nittka, P. Rammelsberg, M. Bendszus, S. Heiland, A. Juerchott
MSVAT-SPACE-STIR and SEMAC-STIR for Reduction of Metallic Artifacts in 3T Head and Neck MRI
American Journal of Neuroradiology May 2018, DOI: 10.3174/ajnr.A5678

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MSVAT-SPACE-STIR and SEMAC-STIR for Reduction of Metallic Artifacts in 3T Head and Neck MRI
T. Hilgenfeld, M. Prager, F.S. Schwindling, M. Nittka, P. Rammelsberg, M. Bendszus, S. Heiland, A. Juerchott
American Journal of Neuroradiology May 2018, DOI: 10.3174/ajnr.A5678
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