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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Quantitative assessment of parallel acquisition techniques in diffusion tensor imaging at 3.0 Tesla.

S Ardekani1, U Sinha

  • 1Dept. of Biomed. Eng., California Univ., Los Angeles, CA, USA.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|February 3, 2007
PubMed
Summary

Parallel imaging reduces distortions in diffusion tensor imaging. GRAPPA reconstruction with an acceleration factor of 2 proved optimal for minimizing artifacts and improving reliability at 3 Tesla.

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Area of Science:

  • Magnetic Resonance Imaging
  • Diffusion Tensor Imaging
  • Medical Physics

Background:

  • Single-shot echo-planar imaging (SS-EPI) in diffusion tensor imaging (DTI) is susceptible to geometric and intensity distortions.
  • These distortions are exacerbated by higher magnetic field strengths.
  • Parallel imaging techniques offer a solution to mitigate these distortions while maintaining spatial resolution.

Purpose of the Study:

  • To quantitatively compare parallel imaging reconstruction methods for DTI at 3 Tesla.
  • To evaluate k-space (GRAPPA) and image domain (SENSE) reconstruction techniques.
  • To determine the optimal parallel imaging strategy for minimizing distortions and artifacts in DTI.

Main Methods:

  • Diffusion tensor imaging data acquired at 3 Tesla.
  • Comparison of GRAPPA (k-space) and SENSE (image domain) parallel imaging reconstructions.
  • Quantitative analysis of distortions, artifacts, and reliability across all voxels in the corpus callosum.

Main Results:

  • GRAPPA reconstruction demonstrated superior performance compared to SENSE.
  • An acceleration factor of 2 for GRAPPA yielded the best results.
  • GRAPPA with acceleration factor 2 minimized distortions and artifacts effectively.

Conclusions:

  • Parallel imaging is essential for high-field DTI to reduce distortions.
  • GRAPPA reconstruction is a highly effective method for parallel imaging in DTI.
  • GRAPPA with an acceleration factor of 2 represents the optimal sequence for 3T DTI acquisition.