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Robust field map generation using a triple-echo acquisition.

Christian Windischberger1, Simon Robinson, Alexander Rauscher

  • 1Department of Medical Physics, Medical University of Vienna, Vienna, Austria.

Journal of Magnetic Resonance Imaging : JMRI
|September 25, 2004
PubMed
Summary
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A new magnetic resonance imaging (MRI) technique rapidly generates magnetic field maps to correct geometric distortions in echo-planar images. This method enhances functional MRI (fMRI) accuracy by improving the alignment of brain activation maps with anatomical structures.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Neuroimaging
  • Medical Physics

Background:

  • Geometric distortions in echo-planar images are a significant challenge in functional MRI (fMRI).
  • Accurate magnetic field mapping is crucial for correcting these distortions.
  • Existing methods can be time-consuming or computationally intensive.

Purpose of the Study:

  • To develop a fast and robust technique for generating magnetic field maps.
  • To enable correction of geometric distortions in echo-planar MR images.
  • To facilitate routine application in functional MRI studies.

Main Methods:

  • Acquisition of multislice gradient-echo (GE) images at multiple echo times (6, 6.5, 7.5 ms).
  • Calculation of seven phase triples per pixel to address phase wrap scenarios.

Related Experiment Videos

  • Linear regression of phase versus echo time to determine the magnetic field (B0 map).

    • Main Results:

    • The technique demonstrated feasibility and effectiveness for field distribution assessment in the brain at 3 Tesla.
    • The method showed particular efficacy in inferior brain regions like the amygdalae and hippocampus.
    • Distortion-corrected echo-planar images using the generated field maps were successfully produced.

    Conclusions:

    • The presented approach provides robust magnetic field map estimation.
    • The method requires less than a minute of acquisition time and seconds of computation.
    • This technique allows for improved coregistration of brain activation maps in routine fMRI studies.