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Related Experiment Videos

Motion associated susceptibility artifacts.

T Bach-Gansmo1, A Ericsson, P Leander

  • 1Department of Diagnostic Radiology, Akademiska Sjukhuset, Uppsala, Sweden.

Acta Radiologica (Stockholm, Sweden : 1987)
|November 1, 1992
PubMed
Summary
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Motion can cause artifacts in abdominal MRI when using superparamagnetic iron particles (SPP) as a bowel labeling agent. Using the lowest effective dose of SPP minimizes these motion-induced artifacts, improving image quality.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Bowel labeling agents are crucial for enhancing abdominal MRI contrast.
  • Contrast agents, including superparamagnetic particles (SPP), can introduce artifacts.
  • Understanding motion-induced artifacts is vital for optimizing SPP use.

Purpose of the Study:

  • To investigate artifacts caused by motion in superparamagnetic particles (SPP) used as bowel labeling agents.
  • To compare motion-induced artifacts from SPP with those from a paramagnetic compound.
  • To determine the effective dose of SPP for minimizing artifacts.

Main Methods:

  • In vitro study at 0.5 T.
  • Evaluation of artifacts generated by SPP under motion.

Related Experiment Videos

  • Comparison with artifacts from a paramagnetic contrast agent.
  • Assessment of artifact visibility at varying iron concentrations (1 mg Fe/ml, 0.2 mg Fe/ml, 0.1 mg Fe/ml).

    • Main Results:

    • Motion-induced artifacts in SPP appeared as signal displacements in the phase-encoding direction.
    • Artifacts were significant at 1 mg Fe/ml, minimal at 0.2 mg Fe/ml, and absent at 0.1 mg Fe/ml.
    • SPP outside the imaging slice also generated artifacts.
    • Paramagnetic agent motion produced mosaic pattern artifacts.

    Conclusions:

    • Motion is a significant factor causing artifacts with SPP bowel labeling agents.
    • The lowest effective dose of SPP (0.1 mg Fe/ml) is recommended to avoid motion artifacts.
    • Careful consideration of SPP concentration and placement is necessary for artifact reduction in abdominal MRI.