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Three-Dimensional Phase Resolved Functional Lung Magnetic Resonance Imaging
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Phase-constrained reconstruction of high-resolution multi-shot diffusion weighted image.

Yiman Huang1, Xinlin Zhang1, Hua Guo2

  • 1Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, School of Electronic Science and Engineering, Xiamen University, Xiamen 361005, China.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|February 18, 2020
PubMed
Summary

This study introduces a novel navigator-free diffusion weighted imaging (DWI) reconstruction method. It effectively reduces artifacts and improves image quality in multi-shot DWI scans.

Keywords:
Diffusion weighted imagingHankel matrixImage reconstructionLow-ranknessMagnetic resonance imaging

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Area of Science:

  • Medical Imaging
  • Radiology
  • Biomedical Engineering

Background:

  • Diffusion Weighted Imaging (DWI) is crucial for tumor diagnosis and stroke evaluation.
  • Conventional single-shot DWI methods suffer from image distortions and low resolution.
  • Multi-shot DWI enhances resolution but introduces phase variations between shots.

Purpose of the Study:

  • To develop an improved reconstruction method for multi-shot navigator-free DWI.
  • To address phase variations and enhance image quality in DWI.

Main Methods:

  • Introduced a smooth phase constraint into multi-shot DWI reconstruction.
  • Utilized the low-rankness of a Hankel matrix constructed from k-space data.
  • Employed partial sum minimization of singular values to enforce low-rankness.

Main Results:

  • The proposed method significantly reduces artifacts compared to state-of-the-art techniques.
  • Demonstrated superior performance in brain imaging data reconstruction.
  • Showcased potential for reconstructing DWI with a higher number of shots.

Conclusions:

  • The developed method offers enhanced artifact removal for multi-shot DWI.
  • This technique shows promise for improving diagnostic accuracy in neuroimaging.
  • The approach could enable higher resolution DWI acquisition in clinical settings.