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Improved body quantitative susceptibility mapping by using a variable-layer single-min-cut graph-cut for

Christof Boehm1, Maximilian N Diefenbach1,2, Marcus R Makowski1

  • 1Department of Diagnostic and Interventional Radiology, Technical University of Munich, Munich, Germany.

Magnetic Resonance in Medicine
|November 5, 2020
PubMed
Summary
This summary is machine-generated.

A new graph-cut algorithm accurately maps magnetic fields in the body, improving quantitative susceptibility mapping (QSM) even with challenging water-fat signals and field variations near signal voids.

Keywords:
Dixon imagingchemical shift encoding-based water-fat separationfield-mappinggraph-cutsquantitative susceptibility mapping

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Computational Science

Background:

  • Quantitative susceptibility mapping (QSM) is crucial for medical imaging.
  • Accurate field-mapping is essential for reliable QSM, especially in complex biological environments.
  • Existing methods struggle with water-fat components, field inhomogeneities, and MR signal voids.

Purpose of the Study:

  • To develop a robust field-mapping algorithm for quantitative susceptibility mapping (QSM).
  • To address challenges posed by water-fat components, field inhomogeneities, and MR signal voids.
  • To apply the developed method to body applications of QSM.

Main Methods:

  • A novel single-min-cut graph-cut framework utilizing variable-layer graph construction was developed.
  • The algorithm addresses water-fat separation cost-functions.
  • The method was validated on numerical phantoms, experimental phantoms, and in vivo scans of head/neck and lumbar spine regions.

Main Results:

  • The proposed method achieved accurate field-map and susceptibility values across all tested datasets.
  • Performance was superior to iterative graph-cut methods, particularly in low SNR regions and areas with significant field variations.
  • The algorithm demonstrated robustness in the presence of MR signal voids and high field values.

Conclusions:

  • A robust single-min-cut graph-cut field-mapping method with variable-layer construction was successfully developed.
  • This method enhances quantitative susceptibility mapping (QSM) in body regions with water-fat components.
  • The technique shows particular promise for improving QSM in areas adjacent to MR signal voids.