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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
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Phase stabilization with motion compensated diffusion weighted imaging.

Ariel J Hannum1,2,3, Tyler E Cork1,2,3, Kawin Setsompop1,4

  • 1Department of Radiology, Stanford University, Stanford, California, USA.

Magnetic Resonance in Medicine
|July 12, 2024
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Summary
This summary is machine-generated.

Gradient moment nulling improves MRI phase consistency by reducing motion-induced signal loss. Applying M1 for neuroimaging and M1+M2 for cardiac imaging minimizes phase variations, enhancing image quality and accuracy.

Keywords:
braincardiacdiffusion‐weighted imagingmotion‐compensationphase

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Diffusion Weighted Imaging (DWI)
  • Medical Physics

Background:

  • Bulk motion during MRI causes intra-voxel and inter-voxel dephasing.
  • This dephasing limits signal-to-noise ratio and complicates multishot MRI acquisitions.
  • Gradient moment nulling is a technique to compensate for motion-induced phase shifts.

Purpose of the Study:

  • To characterize the improvements in phase consistency using gradient moment nulling of diffusion encoding waveforms.
  • To evaluate the effectiveness of different levels of gradient moment nulling (M0, M1, M1+M2) in reducing phase variations.

Main Methods:

  • Healthy volunteers (N=10 for neuro, N=10 for cardiac MRI) underwent diffusion-weighted imaging.
  • Three gradient moment nulling levels (M0, M1, M1+M2) were tested across three experimental paradigms.
  • Temporal phase standard deviation (SD) and spatial phase gradients were assessed for significant differences (p<0.05).

Main Results:

  • M1 and M1+M2 nulling significantly reduced temporal phase SD in neuroimaging (Exp-1).
  • M1+M2 nulling significantly decreased temporal phase SD in cardiac imaging (Exp-3), also reducing spatial phase gradients.
  • M1+M2 nulling in cardiac DWI minimized signal attenuation and improved ADC accuracy.

Conclusions:

  • Gradient moment nulling effectively enhances phase consistency in diffusion-weighted MRI.
  • M1 nulling is optimal for neuroimaging, while M1+M2 nulling is superior for cardiac imaging.
  • These optimized nulling strategies minimize phase variations, leading to improved image quality and quantitative accuracy.