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Improved MR venography using quantitative susceptibility-weighted imaging.

Saifeng Liu1, Karen Mok, Jaladhar Neelavalli

  • 1School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada.

Journal of Magnetic Resonance Imaging : JMRI
|June 14, 2014
PubMed
Summary
This summary is machine-generated.

True SWI (tSWI) enhances vein and microbleed visualization by removing geometric dependencies in phase-based masks. This novel approach improves contrast-to-noise ratios for better imaging in susceptibility-weighted imaging (SWI).

Keywords:
phase imagingquantitative susceptibility mappingsusceptibility-weighted imaging

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Area of Science:

  • Neuroimaging
  • Medical Physics

Background:

  • Susceptibility-weighted imaging (SWI) is crucial for visualizing venous structures and microbleeds.
  • Phase-based susceptibility weighting masks in SWI can be geometry-dependent, limiting visualization accuracy.
  • Improving the visualization of deep and superficial veins and microhemorrhages is clinically significant.

Purpose of the Study:

  • To develop a novel SWI technique (tSWI) that eliminates geometry dependence in phase-based susceptibility weighting masks.
  • To enhance the visualization of cerebral veins and microbleeds.
  • To improve the diagnostic utility of SWI in neuroimaging.

Main Methods:

  • True SWI (tSWI) was generated using susceptibility-based masks, with simulations to assess mask parameter influence.
  • In vivo data from healthy volunteers were used to compare contrast-to-noise ratios (CNRs) of specific veins between tSWI and conventional SWI.
  • A traumatic brain injury (TBI) patient dataset was utilized to qualitatively assess microbleed visualization with tSWI.

Main Results:

  • tSWI demonstrated a significant improvement in CNR for selected veins compared to conventional SWI, exceeding threefold for isotropic resolution and 30% for anisotropic resolution.
  • tSWI effectively enhanced veins regardless of their orientation.
  • The blooming artifact associated with microbleeds in conventional SWI was notably reduced in tSWI for the TBI case.

Conclusions:

  • True SWI (tSWI) effectively overcomes the geometric limitations inherent in phase-based susceptibility weighting.
  • tSWI provides superior visualization of the venous system, particularly for data acquired with isotropic resolution.
  • The improved visualization of veins and reduced artifacts make tSWI a promising advancement for neuroimaging.