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Continuous wave MRI of heterogeneous materials.

Andrew J Fagan1, Gareth R Davies, James M S Hutchison

  • 1Department of Bio-Medical Physics and Bio-Engineering, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, UK. a.fagan@biomed.abdn.ac.uk

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|August 14, 2003
PubMed
Summary

A new 7 Tesla (T) continuous wave Magnetic Resonance Imaging (MRI) system effectively images heterogeneous materials. This advanced MRI technique visualizes internal structures and properties in diverse samples like cement and sandstone.

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Area of Science:

  • Materials Science
  • Physics
  • Engineering

Background:

  • Magnetic Resonance Imaging (MRI) is a powerful non-invasive imaging technique.
  • Continuous wave (CW) MRI offers potential advantages for specific material characterization.
  • High field strengths (e.g., 7 Tesla) can enhance sensitivity and resolution.

Purpose of the Study:

  • To evaluate a prototype continuous wave (CW) 7 Tesla (T) MRI system for imaging heterogeneous materials.
  • To assess the system's capability in determining material properties like T2 relaxation.
  • To demonstrate the system's application in diverse material science contexts.

Main Methods:

  • Utilized a prototype continuous wave (CW) 7 Tesla (T) MRI system.
  • Imaged a poly(methyl methacrylate) (PMMA) resolution phantom to determine spatial resolution.

Related Experiment Videos

  • Studied cement and sandstone samples to investigate hydration, drying, water penetration, and structural influences on transport properties.
  • Imaged a confectionery bar to demonstrate broad applicability.

    • Main Results:

    • Achieved approximately 1mm spatial resolution with a 200 mT/m gradient strength using the PMMA phantom (T2=38 microseconds).
    • Successfully visualized inhomogeneities in cement samples related to curing conditions.
    • Revealed that sedimentary layering in North Sea sandstone affects water transport properties.
    • Clearly discerned the internal structure of a confectionery bar (T2* approximately 50-60 ms).

    Conclusions:

    • The prototype CW 7T MRI system is a viable tool for characterizing heterogeneous materials.
    • The system provides valuable insights into material properties and structural influences on behavior.
    • Demonstrated broad applicability across materials science, including construction materials, geological samples, and food products.