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Susceptibility-weighted imaging (SWI) enhances MRI contrast for better visualization of iron, blood, and calcifications. This review covers SWI basics, artifact reduction, and diverse clinical applications beyond the brain.

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Area of Science:

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

Background:

  • Susceptibility-weighted imaging (SWI) leverages local magnetic field variations to improve contrast in MRI.
  • SWI is crucial for visualizing susceptibility sources like deoxyhemoglobin, iron, hemorrhages, and calcifications.
  • It serves as a foundation for quantitative susceptibility mapping (QSM).

Purpose of the Study:

  • To review the fundamental principles of SWI, including data acquisition, reconstruction, and post-processing.
  • To investigate the origins of cusp artifacts in phase images and present an improved algorithm for their mitigation.
  • To highlight the expanding clinical utility of SWI in various neurological and non-neurological conditions.

Main Methods:

  • Review of SWI principles and techniques.
  • Detailed investigation of phase image artifacts.
  • Development and presentation of an improved multi-channel phase data combination algorithm.
  • Compilation of clinical case examples.

Main Results:

  • SWI effectively enhances contrast for susceptibility sources.
  • An improved algorithm for combining multi-channel phase data reduces cusp artifacts.
  • SWI demonstrates broad clinical applicability in stroke, TBI, liver disease, and more.

Conclusions:

  • SWI is an established clinical tool with diverse applications.
  • Artifact reduction techniques improve SWI diagnostic accuracy.
  • Further development of SWI, particularly with QSM, is a key future direction.