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Related Experiment Videos

Centering the projection reconstruction trajectory: reducing gradient delay errors.

Dana C Peters1, J Andrew Derbyshire, Elliot R McVeigh

  • 1Laboratory of Cardiac Energetics, NHLBI, National Institutes of Health, DHHS, Bethesda, Maryland 20892, USA. petersd@nih.gov

Magnetic Resonance in Medicine
|June 20, 2003
PubMed
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Gradient timing delays in projection reconstruction (PR) MRI cause artifacts. Correcting these delays significantly reduces echo time variability and image artifacts, enhancing PR trajectory clinical use.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Image Reconstruction

Background:

  • Projection Reconstruction (PR) MRI offers advantages but is sensitive to gradient timing inaccuracies.
  • Gradient delays can lead to k-space center under-sampling and angularly dependent echo time variations.
  • These variations introduce artifacts and limit the clinical applicability of PR techniques.

Purpose of the Study:

  • To investigate the impact of gradient timing delays on PR MRI trajectories.
  • To develop and validate a method for correcting these gradient delays.
  • To assess the effectiveness of the correction in reducing artifacts and improving image quality.

Main Methods:

  • Measured gradient timing delays (x, y, z) in phantoms using a calibration method.

Related Experiment Videos

  • Implemented trajectory correction by adding compensatory gradient areas to prephasers.
  • Evaluated correction efficacy by measuring echo time variability and assessing image artifacts in phantoms and volunteers.

    • Main Results:

    • Identified gradient timing delays up to 5 microseconds.
    • Demonstrated that uncorrected trajectories lead to angularly dependent k-space center misses.
    • Achieved a reduction in effective projection-to-projection echo time variability to less than 1 microsecond post-correction.
    • Observed significant reduction in image artifacts in both phantom and volunteer studies.

    Conclusions:

    • Gradient timing delays are a critical factor affecting PR MRI trajectory accuracy.
    • A practical calibration and correction method effectively mitigates these delays.
    • The correction enhances image quality and supports broader clinical adoption of the PR trajectory.