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Dynamic water/fat separation and inhomogeneity mapping-joint estimation using undersampled triple-echo multi-spoke

Zhengguo Tan1,2, Dirk Voit1, Jost M Kollmeier1

  • 1Biomedizinische NMR, Max-Planck-Institut für biophysikalische Chemie, Göttingen, Germany.

Magnetic Resonance in Medicine
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Summary

This study presents a new MRI method for fast, accurate water/fat separation and magnetic field mapping. The technique enables real-time imaging of organs like the knee, liver, and heart, even with motion.

Keywords:
model-based reconstructionnonlinear inversionoff-resonanceradial MRIreal-time MRIwater/fat separation

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Area of Science:

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

Background:

  • Dynamic water/fat separation and magnetic field (B0) inhomogeneity mapping are crucial in MRI.
  • Undersampled acquisitions accelerate MRI but require advanced reconstruction techniques.

Purpose of the Study:

  • To develop and validate a model-based reconstruction for undersampled triple-echo multi-spoke radial FLASH MRI.
  • To achieve simultaneous dynamic water/fat separation and B0 inhomogeneity mapping.

Main Methods:

  • Introduced a novel undersampled triple-echo multi-spoke radial FLASH sequence with complementary spokes, asymmetric echoes, and golden angle increment.
  • Employed a model-based reconstruction to jointly estimate water, fat, B0 inhomogeneity, and coil sensitivity maps.
  • Validated the method using phantom experiments and real-time MRI of the knee, liver, and heart.

Main Results:

  • Achieved up to 18-fold undersampling with reliable water/fat separation and smooth B0 inhomogeneity maps.
  • Demonstrated robustness against physiological motion, B0 inhomogeneities, and phase wrapping.
  • Obtained high temporal resolutions: 70 ms (knee), 158 ms (liver), and 40 ms (heart).

Conclusions:

  • The combined triple-echo acquisition and joint reconstruction offer a practical solution for time-resolved, motion-robust water/fat separation.
  • Achieved high spatial and temporal resolution in dynamic MRI applications.
  • This method enhances the utility of MRI for various clinical applications requiring rapid tissue characterization.