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Related Experiment Videos

Self-navigated spiral fMRI: interleaved versus single-shot

G H Glover1, S Lai

  • 1Stanford University School of Medicine, Department of Diagnostic Radiology, California 94305-5488, USA.

Magnetic Resonance in Medicine
|March 14, 1998
PubMed
Summary
This summary is machine-generated.

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Self-navigation significantly reduces image noise in functional MRI (fMRI) spiral acquisitions. With corrections, both single-shot and multishot spiral fMRI methods prove highly effective for brain imaging.

Area of Science:

  • Neuroimaging
  • Magnetic Resonance Imaging (MRI)
  • Functional MRI (fMRI)

Background:

  • Functional MRI (fMRI) is crucial for understanding brain activity.
  • Spiral gradient-recalled echo sequences are widely used in fMRI.
  • Image quality in fMRI can be affected by noise and off-resonance artifacts.

Purpose of the Study:

  • To compare the performance of 1-, 2-, and 4-shot spiral fMRI acquisitions.
  • To evaluate the impact of self-navigator correction on image noise and off-resonance effects.
  • To assess the effectiveness of different spiral acquisition strategies for fMRI.

Main Methods:

  • Acquisitions were performed using 1-, 2-, and 4-shot spiral gradient-recalled echo sequences.
  • Scans were conducted under constant resolution and scan time, with two readout durations.

Related Experiment Videos

  • Image reconstructions were performed with and without self-navigator correction and retrospective linear shim.

    • Main Results:

    • Self-navigator correction reduced image fluctuation noise by 50% in 4-shot acquisitions.
    • Multishot acquisitions performed comparably to single-shot techniques when self-navigation was applied.
    • Off-resonance effects causing blurring were identified and effectively corrected using retrospective linear shim.

    Conclusions:

    • Self-navigation is a valuable technique for improving image quality in multishot spiral fMRI.
    • Retrospective linear shim effectively corrects off-resonance artifacts, even with longer readout durations.
    • Combined navigator and shim correction enables highly effective single-shot and multishot spiral fMRI acquisitions.