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Related Experiment Videos

Reduced field-of-view MRI using outer volume suppression for spinal cord diffusion imaging.

B J Wilm1, J Svensson, A Henning

  • 1Institute of Neuroradiology, University Hospital Zurich, Zurich, Switzerland. wilm@biomed.ee.ethz.ch

Magnetic Resonance in Medicine
|February 28, 2007
PubMed
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This study introduces a new diffusion-weighted imaging technique for spinal cord scans at 3T. It effectively reduces artifacts, improving image quality for clinical studies.

Area of Science:

  • Magnetic Resonance Imaging
  • Neuroimaging
  • Spinal Cord Imaging

Background:

  • Diffusion-weighted imaging (DWI) is crucial for spinal cord evaluation.
  • Susceptibility effects and motion artifacts degrade spinal cord DWI quality at high field strengths (3T).
  • Existing techniques struggle to simultaneously address these artifacts.

Purpose of the Study:

  • To develop and validate a novel spin-echo single-shot echo-planar imaging (SS-EPI) technique.
  • To reduce susceptibility effects and motion artifacts in 3T spinal cord DWI.
  • To improve image quality and clinical applicability of spinal cord DWI.

Main Methods:

  • Implementation of a reduced field of view (FOV) in the phase-encoding direction.
  • Utilizing an outer volume suppression (OVS) sequence to minimize aliasing.

Related Experiment Videos

  • Employing a slice-selection gradient-reversal technique for effective fat suppression.
  • Optimization of OVS via numerical simulations considering T(1) relaxation and B(1) variations.
  • In vitro and in vivo evaluation of the optimized sequence.

    • Main Results:

    • Simulations demonstrated OVS suppression to <0.25% (optimal) and ~3% (worst-case).
    • In vitro measurements showed a mean residual signal of <0.95% +/- 0.42.
    • In vivo scans achieved artifact-free images with 0.9 x 1.05 mm(2) in-plane resolution.
    • The technique significantly reduces susceptibility and motion artifacts.

    Conclusions:

    • The developed SS-EPI technique effectively minimizes artifacts in 3T spinal cord DWI.
    • The optimized OVS and fat suppression strategies enhance image quality.
    • The short acquisition time makes this technique highly promising for clinical applications and research.