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Related Experiment Videos

Local diffusion and diffusion-T2 distribution measurements in porous media.

S Vashaee1, B Newling1, B MacMillan1

  • 1UNB MRI Centre, Department of Physics, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|April 8, 2017
PubMed
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New magnetic resonance techniques enable spatially resolved measurements of molecular diffusion and diffusion-T2 distributions. This method offers improved sensitivity for characterizing porous media, especially at low magnetic fields.

Area of Science:

  • Magnetic Resonance Imaging
  • Materials Science

Background:

  • Characterizing porous media is crucial for understanding fluid flow and storage.
  • Spatially resolved diffusion measurements are essential for detailed analysis of complex materials.
  • Low-field magnetic resonance faces sensitivity challenges for conventional imaging methods.

Purpose of the Study:

  • To develop novel slice-selective pulsed field gradient (PFG) and PFG-T2 measurement techniques.
  • To enable spatially resolved molecular diffusion and diffusion-T2 distribution measurements.
  • To enhance the characterization of oil-water mixtures in porous media, particularly at low magnetic fields.

Main Methods:

  • Employed a spatially selective adiabatic inversion pulse for slice selection, defining a coarse slice (approx. 1cm).
Keywords:
Adiabatic inversionCPMGD-T(2)DiffusionInverse Laplace transform NMRMagnetic resonancePorous mediaRelaxation timesSlice-selectionSpin echoΔB(0)(t)

Related Experiment Videos

  • Developed slice-selective pulsed field gradient (PFG) and PFG-T2 measurement sequences.
  • Utilized simulations to examine off-resonance effects of transient field offsets (ΔB0(t)).

    • Main Results:

    • Successfully measured spatially-resolved molecular diffusion and diffusion-T2 distributions.
    • Demonstrated inherent sensitivity advantage over phase-encoding imaging methods due to signal localization from a thick slice.
    • Identified that using real data instead of magnitude data can avoid ΔB0 offset artifacts in D-T2 distribution measurements.

    Conclusions:

    • The developed slice-selective PFG and PFG-T2 methods provide a sensitive approach for porous media analysis.
    • The technique is particularly advantageous for low-field magnetic resonance applications where sensitivity is limited.
    • Future work should focus on mitigating artifacts like ΔB0(t) for more accurate D-T2 distribution measurements.