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Rapid Geometry-Corrected Echo-Planar Diffusion Imaging at Ultrahigh Field: Fusing View Angle Tilting and Point-Spread

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Fused View Angle Tilting-Echo Planar Imaging (VAT-EPI) with Point Spread Function mapping (PSF-EPI) corrects distortions and blurring in ultrahigh-field MRI. This novel VAT-PSF-EPI enables accelerated, high-resolution diffusion imaging with improved accuracy.

Keywords:
DTIEPIPSFUHFVATdistortion correction

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Advanced Pulse Sequence Development
  • High-Field Imaging Techniques

Background:

  • Single-shot Echo Planar Imaging (EPI) is hindered by geometric distortions from tissue susceptibility, chemical shift, and eddy currents, especially at ultrahigh fields.
  • View Angle Tilting (VAT)-EPI reduces in-plane distortion but causes image blurring, limiting its application.
  • Point Spread Function mapping (PSF)-EPI corrects distortions and blurring but requires extended scan times.

Purpose of the Study:

  • To present a fused VAT-PSF-EPI sequence combining the strengths of both VAT-EPI and PSF-EPI.
  • To explore the potential for acceleration in the novel VAT-PSF-EPI sequence.
  • To address the limitations of distortion and blurring in high-resolution, ultrahigh-field EPI.

Main Methods:

  • MR signal equations were derived to quantify blurring in VAT-EPI and acceleration capacity in VAT-PSF-EPI.
  • Phantom measurements at 7 Tesla were conducted with varying parallel imaging factors, slice thicknesses, and RF pulses.
  • In vivo human brain scans with T2 and diffusion weighting were acquired to assess distortion and blurring correction.

Main Results:

  • VAT effectively suppresses distortion, and PSF encoding corrects VAT-induced blurring.
  • Up to fourfold acceleration (5 shots) was achieved with VAT-PSF-EPI compared to standard PSF-EPI.
  • In vivo T2-weighted EPI (1.4 mm³ resolution) showed immunity to water-fat shift distortion, and high-resolution diffusion-weighted EPI demonstrated immunity to eddy current distortion.

Conclusions:

  • VAT-PSF-EPI is a novel spin-echo EPI-based sequence.
  • It enables fast, high-resolution diffusion imaging at ultrahigh fields.
  • The sequence effectively corrects distortions and blurring while allowing for significant acceleration.