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Related Experiment Videos

Susceptibility weighted imaging (SWI).

E Mark Haacke1, Yingbiao Xu, Yu-Chung N Cheng

  • 1Department of Radiology, Wayne State University, Detroit, MI, USA. nmrimaging@aol.com

Magnetic Resonance in Medicine
|August 31, 2004
PubMed
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Susceptibility-weighted imaging (SWI) uses MRI phase information to enhance tissue contrast, revealing details not visible with standard MRI. This technique improves visualization of brain structures like gray and white matter, iron deposits, and blood vessels.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Physics

Background:

  • Standard MRI sequences (T1-, T2-weighted, spin density) provide contrast based on relaxation properties.
  • Tissue magnetic susceptibility differences are not fully exploited by conventional MRI contrast mechanisms.
  • Phase information in MRI, arising from susceptibility variations, offers a novel contrast source.

Purpose of the Study:

  • To introduce and validate susceptibility-weighted imaging (SWI) as a novel MRI contrast technique.
  • To demonstrate the utility of phase imaging for enhancing contrast between tissues with differing magnetic susceptibilities.
  • To establish an optimal method for combining magnitude and phase images for improved visualization.

Main Methods:

  • Utilizing phase shifts from magnetic susceptibility differences at long echo times (TEs).

Related Experiment Videos

  • High-pass filtering of phase images and transformation into an amplitude-varying phase mask.
  • Multiplying the phase mask into the magnitude image to create susceptibility-weighted contrast.
  • Mathematical analysis to determine optimal phase mask multiplication iterations.

    • Main Results:

    • Phase images provide excellent contrast between gray matter (GM) and white matter (WM).
    • SWI effectively visualizes iron-laden tissues, venous blood vessels, and other susceptibility-mismatched structures.
    • Projection phase images demonstrate tissue and vessel continuity.
    • Enhanced GM/WM contrast, water/fat contrast, brain iron identification, and vein visualization were achieved.

    Conclusions:

    • Susceptibility-weighted imaging (SWI) offers a powerful new contrast mechanism in MRI.
    • SWI significantly enhances the visualization of structures based on magnetic susceptibility differences.
    • The developed method provides valuable diagnostic information for various neurological applications.