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High-resolution distortion-free diffusion imaging using hybrid spin-warp and echo-planar PSF-encoding approach.

Myung-Ho In1, Oleg Posnansky2, Oliver Speck3

  • 1Department of Biomedical Magnetic Resonance, Institute for Experimental Physics, Otto-von-Guericke University Magdeburg, Germany; Department of Neurologic Surgery, Mayo Clinic, Rochester, MN, USA.

Neuroimage
|January 10, 2017
PubMed
Summary

This study introduces a novel diffusion-weighted imaging method for ultra-high field MRI. It achieves submillimeter resolution brain imaging without distortions, enhancing visualization of tissue microstructure.

Keywords:
Diffusion imagingDiffusion-weighted imageHigh resolutionPoint spread functionUltra-high field

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Area of Science:

  • Magnetic Resonance Imaging
  • Neuroimaging
  • Biomedical Engineering

Background:

  • High-resolution diffusion-weighted imaging (DWI) offers insights into in-vivo tissue microstructure.
  • Single-shot echo-planar imaging (EPI) is common for DWI but limited by distortions at ultra-high fields (UHF).
  • Susceptibility and eddy currents at 7T UHF MRI cause T2* blurring and geometric distortions, hindering high-resolution DWI.

Purpose of the Study:

  • To develop and optimize a distortion-free, high-resolution DWI method for UHF MRI.
  • To adapt a hybrid spin-warp and EPI encoding strategy for improved diffusion imaging.
  • To enable clear delineation of human brain structures using diffusion contrasts at 7T and 3T.

Main Methods:

  • A hybrid spin-warp and EPI encoding strategy inspired by point spread function (PSF) mapping was adapted.
  • A 2D navigator echo was incorporated for motion-induced phase error correction.
  • Variable k-space spacing in the PSF dimension and parallel imaging in the EPI dimension were used for acceleration.

Main Results:

  • The method achieved isotropic submillimeter resolution at 7T without T2* blurring or geometric distortions.
  • It enabled clear and detailed in-vivo delineation of human brain structures with diffusion contrasts.
  • Results for high-resolution diffusion imaging at 3T were also presented.

Conclusions:

  • The proposed hybrid DWI sequence effectively overcomes limitations of traditional EPI at UHF.
  • This technique provides high-fidelity, distortion-free, submillimeter resolution diffusion imaging of the brain.
  • The method holds significant potential for advanced neuroimaging research and clinical applications.