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High angular resolution diffusion imaging with stimulated echoes: compensation and correction in experiment design

Henrik Lundell1, Daniel C Alexander, Tim B Dyrby

  • 1Danish Research Centre for Magnetic Resonance, Centre for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital Hvidovre, Denmark.

NMR in Biomedicine
|June 4, 2014
PubMed
Summary

Stimulated Echo Acquisition Mode (STEAM) diffusion MRI offers advantages for long diffusion times. A simple compensation method corrects for gradient pulse artifacts, improving experimental design and data accuracy in diffusion imaging.

Keywords:
HARDISTEAMdiffusion MRIdiffusion tensor imagingstimulated echo

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Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Physics

Background:

  • Stimulated Echo Acquisition Mode (STEAM) diffusion MRI is suitable for long diffusion times, especially at high magnetic fields (7T and above) where T2 relaxation is short.
  • However, non-diffusion gradient pulses in STEAM sequences introduce significant diffusion weighting, disrupting experimental design compared to Pulsed-Gradient Spin-Echo (PGSE).

Purpose of the Study:

  • To introduce a simple compensation technique for STEAM diffusion MRI to mitigate artifacts caused by non-diffusion gradient pulses.
  • To improve the accuracy and reliability of diffusion imaging experiments, particularly at high field strengths.

Main Methods:

  • A novel compensation method was developed by adjusting gradient vectors within the STEAM sequence's diffusion pulses.
  • High Angular Resolution Diffusion Imaging (HARDI) data were acquired both with and without the proposed compensation.
  • Diffusion Tensor Imaging (DTI) maps were derived from the acquired data to evaluate the compensation's effectiveness.

Main Results:

  • Uncompensated STEAM acquisitions exhibited orientational bias and disrupted experimental design due to extraneous gradient pulses.
  • Standard DTI parameter maps derived from uncompensated data showed significant bias.
  • Retrospective correction using the full B-matrix partially addressed confounds but did not fully eliminate the experimental design issues.

Conclusions:

  • The proposed compensation method effectively corrects orientational bias and experimental design disruptions in STEAM diffusion MRI.
  • Accurate diffusion imaging, especially at high fields, requires this acquisition-level compensation to remove the effects of non-diffusion gradients.
  • The compensation is easily implemented by modifying gradient vectors in the diffusion pulses.