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Quantitative Susceptibility Mapping: Concepts and Applications.

J R Reichenbach1,2, F Schweser3,4, B Serres1

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Summary
This summary is machine-generated.

Susceptibility-weighted imaging (SWI) and quantitative susceptibility mapping (QSM) leverage magnetic susceptibility for enhanced MRI contrast. These techniques are increasingly used clinically, with QSM offering quantitative insights into tissue composition.

Keywords:
Magnetic resonance imagingMagnetic susceptibilityQuantitative susceptibility mappingSusceptibility-weighted imaging

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Neuroimaging

Background:

  • Magnetic susceptibility differences in tissues cause image artifacts in Magnetic Resonance Imaging (MRI).
  • Susceptibility-weighted imaging (SWI) utilizes phase shifts to enhance contrast and visualize structures like veins and iron deposits.
  • Quantitative Susceptibility Mapping (QSM) is an advanced postprocessing technique that quantifies magnetic susceptibility.

Purpose of the Study:

  • To review the fundamental principles of SWI and QSM.
  • To discuss recent clinical developments and applications of SWI and QSM.

Main Methods:

  • SWI enhances image contrast by exploiting phase shifts from magnetic susceptibility differences.
  • QSM numerically solves the inverse problem to derive local tissue magnetic susceptibility from phase images.
  • Both methods utilize gradient-echo sequences and phase information.

Main Results:

  • SWI is established in clinical and biomedical applications, detecting iron, calcifications, veins, blood, and bone.
  • QSM shows rapid progress in algorithms and clinical applications, offering quantitative analysis of lesions.
  • SWI and QSM improve visualization of structures difficult to detect with conventional MRI.

Conclusions:

  • Magnetic susceptibility, once an artifact source, is now a valuable source of MRI contrast.
  • SWI and QSM are gaining clinical acceptance for their diagnostic capabilities.
  • QSM provides direct quantitative insights into tissue magnetic properties, composition, and organization.