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Correction of gradient-induced phase errors in radial MRI.

Amir Moussavi1, Markus Untenberger, Martin Uecker

  • 1Biomedizinische NMR Forschungs GmbH am MPI für biophysikalische Chemie, Göttingen, Germany; DFG Research Center for Molecular Physiology of the Brain (CMPB), Göttingen, Germany.

Magnetic Resonance in Medicine
|February 27, 2013
PubMed
Summary

This study presents a novel method to correct gradient-induced phase errors in radial MRI, significantly improving image quality. The technique quantifies and corrects these errors from raw data without extra measurements, preserving essential phase information.

Keywords:
eddy currentsphase errorsradial MRIreal-time MRI

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Image Reconstruction

Background:

  • Gradient-induced eddy currents cause phase errors in MRI, leading to artifacts in non-Cartesian imaging like radial trajectories.
  • Existing methods address gradient delays but not the inherent phase errors.
  • Accurate phase correction is crucial for high-fidelity MRI reconstruction.

Purpose of the Study:

  • To develop and validate a method for correcting gradient-induced phase errors in radial MRI.
  • To improve image quality by mitigating artifacts caused by eddy currents.
  • To provide a data-driven approach for phase error correction.

Main Methods:

  • A novel method to quantify and correct phase errors directly from raw radial MRI data.
  • The approach determines a specific phase error per gradient for correction prior to image reconstruction.
  • Validation performed using phantom studies at 9.4 Tesla.

Main Results:

  • Demonstrated marked improvements in radial MRI image quality in phantom studies.
  • Confirmed that phase correction is effective even with data undersampling.
  • Showcased the retention of physiologically relevant phase information from contrast agents.

Conclusions:

  • The proposed method offers a simple, effective way to correct gradient-induced phase errors in radial MRI.
  • It requires no additional reference measurements, simplifying the workflow.
  • The technique successfully separates eddy current-induced phase errors while preserving object-specific phase information.