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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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Method for B0 off-resonance mapping by non-iterative correction of phase-errors (B0-NICE).

Junmin Liu1, Maria Drangova1,2

  • 1Imaging Research Laboratories, Robarts Research Institute, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Canada.

Magnetic Resonance in Medicine
|October 30, 2014
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Summary

This study introduces B0-NICE, a novel multiecho phase-unwrapping method for accurate B0 and fat-fraction (FF) mapping. The method corrects phase errors using magnitude data, improving B0 field estimation in challenging conditions.

Keywords:
B0 mapfat/water separationmultiechophase unwrapping

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging (MRI)
  • Quantitative MRI

Background:

  • Accurate B0 mapping is crucial for quantitative MRI.
  • Existing phase-unwrapping methods can struggle with B0 inhomogeneity.
  • Fat-fraction (FF) estimation accuracy depends on precise B0 field maps.

Purpose of the Study:

  • To develop and validate a multiecho phase-unwrapping-based B0 mapping technique.
  • To improve the accuracy of B0 field estimation in the presence of magnetic field inhomogeneities.
  • To enable accurate fat-fraction quantification using MRI.

Main Methods:

  • Developed the Non-Iterative Correction of phase-Errors (B0-NICE) method.
  • Generated initial B0 maps using a "pseudo in-phase" dataset with a bias frequency shift.
  • Corrected phase errors by integrating both phase and magnitude information.
  • Evaluated performance using data from the 2012 ISMRM Challenge.

Main Results:

  • B0-NICE generated more realistic B0 maps than the GOOSE method under significant B0 inhomogeneity.
  • The method demonstrated accurate B0 field estimation from multiecho data.
  • Accurate fat-fraction (FF) maps were successfully achieved using the B0-NICE algorithm.

Conclusions:

  • Accurate FF and B0 maps are achievable by independently processing magnitude data to correct phase errors in phase-unwrapped B0 maps.
  • The B0-NICE method offers improved B0 and FF quantification in MRI.
  • The B0-NICE software is publicly available for research use.