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Related Experiment Videos

Zero and first-order phase shift correction for field map estimation with dual-echo GRE using bipolar gradients.

Desmond T B Yeo1, Thomas L Chenevert, Jeffrey A Fessler

  • 1Department of Radiology, University of Michigan Medical School, Ann Arbor, MI 48109, USA.

Magnetic Resonance Imaging
|April 20, 2007
PubMed
Summary

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This study introduces a simple phase error correction for dual-echo gradient-echo (GRE) sequences, improving magnetic field map accuracy by reducing motion artifacts. The technique effectively corrects errors, enhancing the reliability of field map estimation in MRI.

Area of Science:

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

Background:

  • Magnetic field inhomogeneity mapping is crucial for MRI quality.
  • Standard field map estimation using separate acquisitions is susceptible to motion artifacts.
  • Dual-echo gradient-echo (GRE) sequences offer potential for improved motion robustness.

Purpose of the Study:

  • To present a simple phase error correction technique for dual-echo GRE sequences.
  • To mitigate dynamic motion errors in magnetic field map estimation.
  • To improve the accuracy and reliability of field maps derived from GRE sequences.

Main Methods:

  • Utilized a dual-echo GRE sequence with back-to-back, opposite polarity readout gradients.
  • Modeled residual phase error from asymmetric readout pulses as an affine term.

Related Experiment Videos

  • Empirically estimated the time-varying zero-order phase correction term.

    • Main Results:

    • The proposed technique effectively factors out interecho motion artifacts and alignment errors.
    • A first-order phase correction term was found to be constant over time.
    • Phantom and human data demonstrated the efficacy of the correction method.

    Conclusions:

    • The developed phase error correction technique enhances the accuracy of field map estimation.
    • The constant first-order correction term allows for application across scans with the same protocol.
    • This method provides a robust approach to address motion-related artifacts in MRI field mapping.