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Related Experiment Videos

Ghost phase cancellation with phase-encoding gradient modulation

R S Hinks1, Q S Xiang, R M Henkelman

  • 1GE Medical Systems, Waukesha, WI 53188.

Journal of Magnetic Resonance Imaging : JMRI
|September 1, 1993
PubMed
Summary
This summary is machine-generated.

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Magnetic resonance imaging (MRI) ghost artifacts from motion are reduced using a phase-encoding gradient modulation technique. This method effectively suppresses ghosting caused by periodic motion, improving image quality.

Area of Science:

  • Medical Imaging
  • Physics
  • Biomedical Engineering

Background:

  • Motion artifacts, particularly ghosting, significantly degrade magnetic resonance image (MRI) quality.
  • Periodic motion creates image replicates (ghosts) in the phase-encoding direction during spin-warp Fourier imaging.
  • These ghost artifacts obscure anatomical details and complicate image interpretation.

Purpose of the Study:

  • To develop and evaluate a method for suppressing motion-induced ghost artifacts in MRI.
  • To improve the diagnostic accuracy of MRI by enhancing image quality.

Main Methods:

  • Acquisition of multiple ghosted images (Ij) with intentionally phase-shifted ghost masks (g) relative to the true spin density (I0).
  • Utilizing interleaved acquisitions with shifted phase-encoding orders or oscillating phase-encoding gradients.

Related Experiment Videos

  • Employing the acquired complex images (Ij) to estimate the original spin density (I0).

    • Main Results:

    • Simulations and experiments demonstrated effective ghost suppression for quasi-periodic motion.
    • The method showed good performance against respiratory and flow artifacts.
    • The primary limitation identified was the requirement for rapid gradient switching.

    Conclusions:

    • Phase-encoding gradient modulation is a viable technique for reducing MRI ghost artifacts.
    • This method can improve image quality in the presence of common motion types.
    • Further research may focus on mitigating the limitations associated with rapid gradient switching.