Artefakte in der Magnetresonanztomographie

MRI with wrap around artifacts. For context, see: MRI artifact
MRI with wrap
around artifacts. For context, see: MRI artifact
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MRI artifacts • MRI artifact - tattooed eyeliner - Ganzer Fall bei Radiopaedia
MRI artifacts
• MRI artifact - tattooed eyeliner - Ganzer Fall bei Radiopaedia
O'Donnell, C. MRI artifact - tattooed eyeliner. Case study, Radiopaedia.org. (accessed on 01 Nov 2022) https://doi.org/10.53347/rID-51842 • CC by-nc-sa 3.0 (modified)
MRI artifacts • Hair extension artifact on MRI - Ganzer Fall bei Radiopaedia
MRI artifacts
• Hair extension artifact on MRI - Ganzer Fall bei Radiopaedia
Bickle I, Hair extension artifact on MRI. Case study, Radiopaedia.org (Accessed on 20 Jan 2023) https://doi.org/10.53347/rID-156144 • CC by-nc-sa 3.0 (modified)
Magnetic susceptibility artifact • Magnetic susceptibility artifact - Ganzer Fall bei Radiopaedia
Magnetic
susceptibility artifact • Magnetic susceptibility artifact - Ganzer Fall bei Radiopaedia
Mudgal, P. Magnetic susceptibility artifact. Case study, Radiopaedia.org. (accessed on 28 Oct 2022) https://doi.org/10.53347/rID-26952 • CC by-nc-sa 3.0 (modified)
Magic angle effect (MRI artifact) • Magic angle effect - MRI artifact - Ganzer Fall bei Radiopaedia
Magic angle
effect (MRI artifact) • Magic angle effect - MRI artifact - Ganzer Fall bei Radiopaedia
Schubert, R. Magic angle effect - MRI artifact. Case study, Radiopaedia.org. (accessed on 26 Oct 2022) https://doi.org/10.53347/rID-14219 • CC by-nc-sa 3.0 (modified)
MRI artifacts • Phase-encoded pulsation artifact - Ganzer Fall bei Radiopaedia
MRI artifacts
• Phase-encoded pulsation artifact - Ganzer Fall bei Radiopaedia
Filimonova, E. Phase-encoded pulsation artifact. Case study, Radiopaedia.org. (accessed on 01 Nov 2022) https://doi.org/10.53347/rID-93837 • CC by-nc-sa 3.0 (modified)
MRI artifacts • Cross-excitation artifact (MRI) - Ganzer Fall bei Radiopaedia
MRI artifacts
• Cross-excitation artifact (MRI) - Ganzer Fall bei Radiopaedia
Hassanzadeh, E. Cross-excitation artifact (MRI). Case study, Radiopaedia.org. (accessed on 01 Nov 2022) https://doi.org/10.53347/rID-90322 • CC by-nc-sa 3.0 (modified)
MRI artifacts • PPE-associated artifact on MRI brain - Ganzer Fall bei Radiopaedia
MRI artifacts
• PPE-associated artifact on MRI brain - Ganzer Fall bei Radiopaedia
O'Donnell, C. PPE-associated artifact on MRI brain. Case study, Radiopaedia.org. (accessed on 01 Nov 2022) https://doi.org/10.53347/rID-80539 • CC by-nc-sa 3.0 (modified)
MRI artifacts • Herringbone artifact - Ganzer Fall bei Radiopaedia
MRI artifacts
• Herringbone artifact - Ganzer Fall bei Radiopaedia
Schubert, R. Herringbone artifact. Case study, Radiopaedia.org. (accessed on 01 Nov 2022) https://doi.org/10.53347/rID-16743 • CC by-nc-sa 3.0 (modified)
MRI with Gibbs artifacts. For context, see: MRI artifact
MRI with
Gibbs artifacts. For context, see: MRI artifact
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ähnliche Suchen
Artefakte in der Magnetresonanztomographie
MRI artifacts
MRT Artefakte
MRI artifact
MRI Artefakte
MRI artefacts
MR artefacts
Artifacts in MRI
Artifact in MRI
Artifacts encountered in MRI
Artifacts encountered in MR imaging
Artefacts in MRI
Artefacts encountered in MRI
Artefacts encountered in MR imaging
Artefact in MRI
MRI artefact
siehe auch
zipper artifact
Liquorpulsationsartefakte
Suszeptibilitätsartefakt
black boundary artifact
chemical shift artifact
zebra stripes
Einfaltungsartefakte
Gibbs-Artefakte
entry slice phenomenon
magic angle effect
moire fringes
phase-encoded motion artefacts
slice-overlap artifact
MR-Artefaktkurs
central point artifact
zero-fill artifact
aliasing
cross excitation
RF overflow artifacts
Corduroy-Artefakt

MRI artifacts are numerous and give an insight into the physics behind each sequence. Some artifacts affect the quality of the MRI exam while others do not affect the diagnostic quality but may be confused with pathology.

When encountering an unfamiliar artifact, it is useful to systematically examine general features of the artifact to try and understand its general class. These features include:

  • type of sequence, e.g. fast spin echo, gradient, volumetric acquisition
  • direction of phase and frequency
  • fat or fluid signal
  • presence of anatomy outside the image field
  • presence of metallic foreign bodies

    • Classification of the artifact type may give one an idea about how to try to fix it.

    Artifacts are caused by a variety of factors that may be patient-related such as voluntary and physiologic motion, metallic implants or foreign bodies. Finite sampling, k-space encoding, and Fourier transformation may cause aliasing and Gibbs artifact. Characteristics of pulse sequences may cause black boundary, Moiré, and phase-encoding artifacts. Hardware issues may cause central point and RF overflow artifacts.

    Remember that artifacts are not all bad, and that occasionally they are intentionally exploited, e.g. susceptibility artifact.

    The artifacts

    Many artifacts have a characteristic appearance and with experience they can be readily identified.

    MRI hardware and room shielding
    MRI software
    Patient and physiologic motion
    Tissue heterogeneity and foreign bodies
    Fourier transform and Nyqvist sampling theorem
    Siehe auch:
    und weiter:
    Assoziationen und Differentialdiagnosen zu Artefakte in der Magnetresonanztomographie:
    Suszeptibilitätsartefakt
    Suszeptibilitätsartefakt
     
    Wikipedia • CC BY-SA 3.0
    Einfaltungsartefakte
    Einfaltungsartefakte
     
    Wikipedia • CC BY 4.0
    Gibbs-Artefakte
    Gibbs-Artefakte
     
    Wikipedia • CC BY 4.0
    magic angle effect
    magic angle
    effect
    Wikipedia • CC BY-SA 3.0
    Liquorpulsationsartefakte
    Liquorpulsationsartefakte
     
    Wikipedia • CC BY-SA 4.0