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Related Experiment Videos

Nonlinear phase correction of navigated multi-coil diffusion images.

David Atkinson1, Serena Counsell, Joseph V Hajnal

  • 1Centre for Medical Image Computing, University College London, United Kingdom. D.Atkinson@ucl.uk

Magnetic Resonance in Medicine
|September 21, 2006
PubMed
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Cardiac pulsatility causes brain motion, leading to phase changes in multi-shot diffusion imaging. This study presents a conjugate gradient reconstruction to correct these changes, significantly reducing motion artifacts and improving image accuracy.

Area of Science:

  • Medical Imaging
  • Neuroimaging
  • Diffusion MRI

Background:

  • Cardiac pulsatility induces nonrigid brain motion, causing spatially varying phase changes in multi-shot diffusion imaging.
  • Accurate motion correction is crucial for reliable diffusion MRI data, especially in regions with non-uniform pulsatile motion.

Purpose of the Study:

  • To develop and validate a conjugate gradient-based reconstruction method for correcting cardiac pulsatility-induced phase changes in multi-shot diffusion imaging.
  • To evaluate the performance of the proposed method in reducing motion artifacts and improving the accuracy of diffusion MRI.

Main Methods:

  • A multi-shot echo planar imaging sequence was employed.
  • A conjugate gradient reconstruction incorporated 2D navigator echoes, coil sensitivity information, navigator-determined weightings, and multi-coil/average data.

Related Experiment Videos

  • The method was applied to brain regions with non-uniform pulsatile motion.

    • Main Results:

    • The proposed multi-shot reconstruction significantly reduced susceptibility artifacts compared to a clinical single-shot sequence.
    • Fiber direction distortions were reduced from 7 mm (single-shot) to less than 2 mm (multi-shot).
    • This enables shorter phase encoding in the left-right direction, allowing for rectangular fields of view and time savings.

    Conclusions:

    • The conjugate gradient reconstruction effectively corrects phase changes caused by cardiac pulsatility in multi-shot diffusion imaging.
    • The method improves image quality and anatomical accuracy, particularly in the brain.
    • This technique facilitates higher resolution diffusion imaging, with potential applications in spine imaging for nerve root visualization.