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Related Experiment Videos

Motion artifacts in quantitative magnetic resonance imaging.

A M Aisen1, G M Glazer, P L Carson

  • 1Department of Radiology, University of Michigan, Ann Arbor 48109.

Magnetic Resonance Imaging
|January 1, 1986
PubMed
Summary
This summary is machine-generated.

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Respiratory motion can cause anomalous intensity reversals in magnetic resonance imaging (MRI) of the upper abdomen. This artifact limits quantitative relaxation time measurements, necessitating respiratory gating for accurate disease assessment.

Area of Science:

  • Medical Imaging
  • Biophysics
  • Radiology

Background:

  • Quantitative relaxation times are valuable for disease assessment.
  • Spin-echo MRI techniques are used for these measurements.
  • Anomalous intensity reversals have been observed in organ parenchyma imaging.

Purpose of the Study:

  • To investigate the cause of anomalous intensity reversals in spin-echo MRI.
  • To determine if respiratory motion can reproduce these artifacts.
  • To assess the impact of these artifacts on quantitative MRI of the upper abdomen.

Main Methods:

  • Spin-echo magnetic resonance imaging (MRI) was performed on volunteers.
  • Quantitative relaxation times were measured.
  • Volunteers were studied before and after exercise to induce respiratory motion.

Related Experiment Videos

  • Intensity reversals in renal parenchyma were analyzed.

    • Main Results:

    • Anomalous intensity reversals, where second-echo images were brighter than first-echo images, were observed.
    • Respiratory motion was identified as the likely cause of these artifacts.
    • Intensity reversals in renal parenchyma were reproduced in two of five individuals after exercise.

    Conclusions:

    • Respiratory motion artifacts significantly limit quantitative MRI of the upper abdomen.
    • Respiratory gating during imaging is essential to overcome these artifacts.
    • Accurate quantitative magnetic resonance imaging requires mitigation of motion-related artifacts.