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Phase-updated regularized SENSE for navigator-free multishot diffusion imaging.

Zhangxuan Hu1, Xiaodong Ma1, Trong-Kha Truong2

  • 1Center for Biomedical Imaging Research, Department of Biomedical Engineering, Tsinghua University, Beijing, China.

Magnetic Resonance in Medicine
|August 14, 2016
PubMed
Summary
This summary is machine-generated.

A new method, Phase-updated Regularized SENSE (PR-SENSE), improves motion correction in diffusion imaging. It combines speed and stability for better image quality in navigator-free multishot diffusion imaging.

Keywords:
POCS-ICEPR-SENSESENSE+CGdiffusion-weighted imaging (DWI)multishot diffusion imagingphase correction

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Area of Science:

  • Magnetic Resonance Imaging
  • Medical Imaging Physics

Background:

  • Navigator-free multishot diffusion imaging requires correction for motion-induced phase errors.
  • Existing methods like SENSE+CG offer fast but unstable convergence, while POCS-ICE provides stable but slow convergence.
  • These limitations hinder optimal image quality and practical application in diffusion-weighted imaging (DWI).

Purpose of the Study:

  • To introduce and evaluate a novel method, Phase-updated Regularized SENSE (PR-SENSE), for motion correction in navigator-free multishot diffusion imaging.
  • To combine the strengths of SENSE+CG and POCS-ICE for improved performance.
  • To enhance image quality and stability in high-resolution DWI.

Main Methods:

  • PR-SENSE utilizes total variation regularization for the SENSE inverse problem, replacing the conjugate gradient method.
  • A lagged diffusivity fixed point iteration algorithm is employed for implementation.
  • The phase is iteratively updated during the process to enhance image accuracy.

Main Results:

  • Simulations and in vivo experiments confirmed PR-SENSE's efficacy in correcting motion-induced phase errors in multishot DWI.
  • The method demonstrated fast and stable convergence, outperforming existing techniques.
  • PR-SENSE successfully improved overall image quality compared to SENSE+CG and POCS-ICE.

Conclusions:

  • PR-SENSE represents a significant advancement for navigator-free high-resolution DWI.
  • The method effectively integrates the benefits of SENSE+CG and POCS-ICE.
  • PR-SENSE offers a robust solution for motion correction, leading to superior image quality.