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Related Experiment Videos

Diffusion and relaxation effects in general stray field NMR experiments.

M D Hürlimann1

  • 1Schlumberger-Doll Research, Ridgefield, Connecticut 06877-4108, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|March 10, 2001
PubMed
Summary

This study analyzes magnetization evolution under strong magnetic field inhomogeneity, revealing non-exponential signal decay due to diffusion and relaxation. Phase cycling separates coherence pathways, validating calculations against stray field measurements.

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Area of Science:

  • Magnetic Resonance Imaging
  • Physical Chemistry
  • Materials Science

Background:

  • Magnetization evolution in inhomogeneous magnetic fields is complex, influenced by diffusion and relaxation.
  • Signal decay can be non-exponential even with uniform relaxation times and diffusion coefficients.
  • Coherence pathways contribute to magnetization behavior in strong field inhomogeneities.

Purpose of the Study:

  • To analyze magnetization evolution under strong magnetic field inhomogeneity.
  • To investigate the impact of diffusion and relaxation effects on signal decay.
  • To validate a general analysis framework using experimental data.

Main Methods:

  • Analysis of magnetization evolution following radiofrequency pulses.
  • Application of phase cycling to separate coherence pathways.

Related Experiment Videos

  • Experimental validation using stray field measurements with inversion recovery and Carr-Purcell-Meiboom-Gill sequences.

    • Main Results:

    • Non-exponential signal decay observed, influenced by diffusion and relaxation.
    • Excellent agreement found between theoretical calculations and experimental measurements.
    • Relaxation time T(1) successfully extracted using two data analysis approaches.
    • Diffusion effects analyzed, showing signal attenuation dependent on g(2)Dt(3)(E)N.

    Conclusions:

    • The developed analysis accurately describes magnetization evolution in strongly inhomogeneous fields.
    • Diffusion and relaxation significantly impact signal decay, leading to non-exponential behavior.
    • Phase cycling is effective for distinguishing coherence pathway contributions.