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Preconditioned total field inversion (TFI) method for quantitative susceptibility mapping.

Zhe Liu1,2, Youngwook Kee2, Dong Zhou2

  • 1Department of Biomedical Engineering, Cornell University, Ithaca, New York, USA.

Magnetic Resonance in Medicine
|July 29, 2016
PubMed
Summary
This summary is machine-generated.

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Total field inversion (TFI) reduces errors in quantitative susceptibility mapping (QSM) by simultaneously estimating background and local fields. This new method improves QSM accuracy and quality, especially with large susceptibility differences.

Area of Science:

  • Medical Imaging
  • Biophysics
  • Magnetic Resonance Imaging

Background:

  • Traditional quantitative susceptibility mapping (QSM) methods often suffer from systematic errors.
  • Sequential background field removal and local field inversion (LFI) can propagate errors in QSM.

Purpose of the Study:

  • To investigate systematic errors in traditional QSM.
  • To develop a total field inversion (TFI) QSM method to reduce these errors.
  • To improve QSM quality, particularly with large susceptibility differences.

Main Methods:

  • Proposed a total field inversion (TFI) as a single optimization problem.
  • Simultaneously estimated background and local fields to prevent error propagation.
  • Introduced and analyzed a new preconditioner to increase computational speed.
Keywords:
QSMbackground field removalpreconditioningtotal field inversion

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  • Compared TFI with traditional methods using simulations, phantoms, healthy subjects, and patients with intracerebral hemorrhage.

    • Main Results:

    • Preconditioned TFI significantly reduced QSM errors at air-tissue boundaries compared to traditional methods.
    • Achieved high-quality in vivo QSM with similar processing times.
    • Suppressed streaking artifacts in QSM for intracerebral hemorrhage.
    • Enabled QSM generation for the entire head, including air sinuses, skull, and fat.

    Conclusions:

    • Preconditioned TFI enhances QSM accuracy compared to methods with separate background and local field estimations.
    • TFI offers improved QSM quality and artifact reduction.