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Related Experiment Videos

Artifacts induced by concomitant magnetic field in fast spin-echo imaging

X J Zhou1, S G Tan, M A Bernstein

  • 1Applied Science Laboratory, GE Medical Systems, Milwaukee, Wisconsin 53201, USA.

Magnetic Resonance in Medicine
|October 15, 1998
PubMed
Summary

New methods address ghosting artifacts in fast spin-echo (FSE) MRI, particularly in large fields of view. Reshaping magnetic field gradients significantly reduces these common imaging artifacts.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics

Background:

  • Fast spin-echo (FSE) MRI with large fields of view (>40 cm) can exhibit ghosting artifacts.
  • These artifacts are linked to higher-order magnetic field perturbations, known as concomitant or Maxwell fields.

Purpose of the Study:

  • To develop and implement novel methods for eliminating concomitant field-induced ghosting artifacts in FSE MRI.
  • To improve image quality in FSE sequences, especially for large field-of-view applications.

Main Methods:

  • Redesigning FSE pulse sequences by adjusting gradient waveforms in slice-selection, phase-encoding, and readout directions.
  • Symmetrizing gradient waveforms about refocusing RF pulses and reshaping crusher gradients to nullify concomitant field phase.
  • Modifying readout gradient prephasing lobes and reducing overlap between gradient waveforms.

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Main Results:

  • Implemented methods on a clinical scanner.
  • Achieved a typical reduction in ghost intensities by a factor of 3 in both phantom and human images.
  • Demonstrated effective artifact reduction where previous methods failed.

Conclusions:

  • The developed gradient reshaping techniques effectively mitigate concomitant field artifacts in FSE MRI.
  • These methods offer a significant improvement in image quality for large field-of-view FSE imaging.
  • The findings have practical implications for clinical MRI diagnostics.