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Related Experiment Videos

Sensitivity and performance time in MRI dephasing artifact reduction methods.

Y Z Wadghiri1, G Johnson, D H Turnbull

  • 1Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, New York 10016, USA. zaim@saturn.med.nyu.edu

Magnetic Resonance in Medicine
|March 10, 2001
PubMed
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Subslice averaging (SSAVE) effectively reduces signal loss in gradient echo MRI by averaging thin slices. This method offers superior performance time compared to alternative susceptibility artifact correction techniques.

Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics
  • Biomedical Engineering

Background:

  • Gradient echo images suffer signal loss due to intravoxel dephasing caused by tissue susceptibility differences.
  • Shimming partially corrects static field inhomogeneity but not local imperfections.
  • Dephasing effects are exacerbated by larger voxel sizes.

Purpose of the Study:

  • To evaluate subslice averaging (SSAVE) as a method to mitigate signal loss in gradient echo MRI.
  • To compare the performance and sensitivity of SSAVE against alternative susceptibility artifact correction techniques.
  • To validate experimental findings in phantoms and animal models.

Main Methods:

  • Implementing subslice averaging (SSAVE) by averaging thin slices to form a thick slice.

Related Experiment Videos

  • Utilizing alternative methods involving slice select rephase gradients to compensate for susceptibility-induced offsets.
  • Comparing image combination techniques: summation, sum of squares, maximum intensity projection, and Fourier transformation.
  • Assessing theoretical sensitivity (SNR/√time) and minimum imaging time.

    • Main Results:

    • SSAVE effectively reduces signal loss caused by intravoxel dephasing.
    • Theoretical sensitivity of SSAVE and alternative methods is comparable.
    • SSAVE demonstrates significantly shorter minimum imaging times compared to alternative techniques.
    • Experimental validation in phantoms and anesthetized mice confirmed SSAVE's efficiency.

    Conclusions:

    • Subslice averaging (SSAVE) is an efficient and fast method for reducing signal loss in gradient echo MRI.
    • SSAVE offers a practical solution for mitigating susceptibility artifacts, especially when speed is critical.
    • The findings challenge previous claims regarding the sensitivity of alternative artifact correction methods.