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Accurate velocity mapping with FAcE

S E Maier1, M B Scheidegger, K Liu

  • 1Institute of Biomedical Engineering and Medical Informatics, University of Zurich, Switzerland.

Magnetic Resonance Imaging
|January 1, 1996
PubMed
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Spin dislocation causes image distortions. The novel FAcE (FID acquired echoes) sequence minimizes these artifacts, enabling clearer velocity mapping of moving spins with reduced distortion.

Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Medical Physics

Background:

  • Spin dislocation in MRI sequences leads to image distortions, particularly affecting velocity mapping.
  • Conventional gradient-echo sequences are susceptible to motion-induced artifacts and signal voids.
  • Minimizing echo time is crucial for reducing velocity-dependent dislocation artifacts.

Purpose of the Study:

  • To introduce and evaluate the FAcE (FID acquired echoes) sequence for velocity mapping.
  • To assess the effectiveness of FAcE in reducing motion-related artifacts compared to conventional sequences.
  • To investigate the application of FAcE for velocity mapping of flow in the slice select direction.

Main Methods:

  • Developed FAcE sequence with separate sampling of k-space half-planes for very short echo times.

Related Experiment Videos

  • Designed a compact velocity-encoding select gradient for high velocity sensitivity at short echo times.
  • Conducted phantom experiments and simulations to study in-plane motion artifacts for FAcE and gradient-echo sequences.

    • Main Results:

    • FAcE sequence achieves very short echo times, enabling inherent motion compensation for the frequency-encoding gradient.
    • FAcE significantly reduces motion-related dislocation artifacts compared to conventional gradient-echo sequences.
    • Signal voids due to coherence loss in irregular flow regions are minimized with FAcE.

    Conclusions:

    • FAcE sequence offers a robust solution for velocity mapping with minimal distortion.
    • The sequence effectively mitigates artifacts caused by spin dislocation and in-plane motion.
    • FAcE is a promising technique for accurate velocity quantification in MRI.