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Scan parameters and the diffusion emphasis effect in diffusion-weighted imaging using a motion-probing gradient

Daisuke Takahashi1, Hajime Tanji, Tomoya Yamaki

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Nihon Hoshasen Gijutsu Gakkai Zasshi
|July 25, 2014
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Diffusion-sensitized driven equilibrium preparation (DSDE) is a novel gradient echo diffusion-weighted imaging technique. Optimizing specific parameters like prep.TE and TFE shot interval enhances its diffusion sensitivity, making it a valuable alternative to conventional methods.

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Area of Science:

  • Magnetic Resonance Imaging
  • Diffusion-Weighted Imaging

Background:

  • Diffusion-weighted imaging (DWI) is crucial for visualizing water diffusion in tissues.
  • Conventional DWI sequences like single-shot echo-planar imaging (EPI) are susceptible to artifacts.
  • Diffusion-sensitized driven equilibrium preparation (DSDE) offers an alternative approach using gradient echo techniques.

Purpose of the Study:

  • To investigate the impact of scan parameters on diffusion sensitivity in DSDE.
  • To identify key parameters for optimizing DSDE performance.
  • To compare DSDE with conventional DWI methods.

Main Methods:

  • Utilized a gradient echo (GRE) sequence with motion-probing gradient (MPG) preparation and phase cycling (DSDE).
  • Systematically varied scan parameters within the MPG preparation pulse and GRE sequence.
  • Evaluated the effect of parameter changes on diffusion emphasis.

Main Results:

  • Identified "prep.TE" in the MPG preparation pulse and "TFE shot interval" in the GRE sequence as critical for diffusion sensitivity.
  • Demonstrated that DSDE can achieve diffusion-weighted images comparable to conventional single-shot EPI DWI.
  • Showcased the influence of specific parameter choices on diffusion contrast.

Conclusions:

  • DSDE is a viable and effective diffusion-weighted imaging method.
  • Optimizing "prep.TE" and "TFE shot interval" is essential for maximizing DSDE's diffusion sensitivity.
  • DSDE presents a useful alternative for DWI applications, potentially offering improved performance or flexibility.