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Cartesian MaxGIRF: Model-based EPI reconstruction incorporating gradient nonlinearity and concomitant field effects.

Nam G Lee1, Sophia X Cui2, Krishna S Nayak1,3

  • 1Alfred E. Mann Department of Biomedical Engineering, University of Southern California, Los Angeles, California, USA.

Magnetic Resonance in Medicine
|October 3, 2025
PubMed
Summary

A new Cartesian MaxGIRF framework corrects EPI distortions from gradient nonlinearity and concomitant fields without spatial blurring. This advanced method improves image quality and mitigates artifacts in MRI scans.

Keywords:
concomitant fieldsecho planar imaginggradient nonlinearityhigher‐order image reconstructionmodel‐based reconstructionoff‐resonance correction

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Area of Science:

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

Background:

  • Lower field strength MRI scanners often suffer from EPI distortions caused by gradient nonlinearity and concomitant fields.
  • Existing correction methods, relying on image-domain interpolation, can lead to undesirable spatial blurring, compromising image quality.
  • These distortions are particularly problematic in scanners with large bore sizes, complex geometries, or strong gradient systems.

Purpose of the Study:

  • To introduce a novel model-based EPI reconstruction framework, Cartesian MaxGIRF, designed to simultaneously compensate for EPI distortions.
  • To avoid the spatial blurring typically introduced by conventional correction techniques.
  • To address distortions arising from concomitant fields, gradient nonlinearity, and off-resonance effects during image reconstruction.

Main Methods:

  • The Cartesian MaxGIRF framework was developed for model-based EPI reconstruction.
  • Performance was evaluated against standard correction methods using phantom and in-vivo human brain datasets at 0.55T.
  • Specific EPI artifacts, including parabolic shift and slice-dependent Nyquist ghost, were investigated and addressed using different EPI sequences (3D GRE-EPI).

Main Results:

  • The proposed framework successfully mitigated parabolic shifts and slice-dependent Nyquist ghosts, artifacts induced by concomitant fields.
  • Cartesian MaxGIRF demonstrated superior retention of image details compared to standard methods when correcting geometric distortions.
  • Theoretical analysis confirmed the mitigation of parabolic shifts across various imaging scenarios.

Conclusions:

  • The Cartesian MaxGIRF framework effectively mitigates EPI distortions from concomitant fields, gradient nonlinearity, and static off-resonance simultaneously.
  • This approach is particularly beneficial for correcting artifacts caused by second-order concomitant fields in both symmetric and asymmetric gradient systems.
  • The method offers an improved solution for enhancing image quality in EPI MRI without introducing spatial blurring.