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Related Experiment Videos

Correction for eddy current induced Bo shifts in diffusion-weighted echo-planar imaging.

F Calamante1, D A Porter, D G Gadian

  • 1Radiology and Physics Unit, Institute of Child Health, University College London Medical School, England. cfernan@ich.ucl.ac.uk

Magnetic Resonance in Medicine
|February 20, 1999
PubMed
Summary

This study introduces an online method to correct eddy current-induced misregistration in diffusion-weighted MRI. This technique generates accurate apparent diffusion coefficient (ADC) maps for acute stroke assessment without postprocessing.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Neuroimaging

Background:

  • Diffusion-weighted MRI (DW-MRI) is crucial for acute stroke assessment.
  • Quantitative apparent diffusion coefficient (ADC) maps are widely used.
  • Echoplanar imaging (EPI) is effective for motion-artifact-free DW-MRI acquisition.

Purpose of the Study:

  • To address challenges in calculating artifact-free ADC maps from EPI DW-MRI.
  • To present an online correction method for eddy current-induced misregistration.
  • To validate the technique using phantom and human imaging.

Main Methods:

  • An online correction method using a non-phase-encoded reference scan.
  • Correction of phase in each echo of the echo train.
  • Acquisition of diffusion-weighted images using echoplanar imaging.

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Main Results:

  • The developed method effectively corrects frequency shifts from eddy currents.
  • Misregistration artifacts in diffusion-weighted images are eliminated.
  • Accurate ADC maps are generated without offline postprocessing.

Conclusions:

  • The online correction method provides artifact-free ADC maps for clinical MRI.
  • This technique enhances the reliability of quantitative diffusion MRI in stroke diagnosis.
  • It simplifies the process of generating accurate ADC maps for acute stroke evaluation.