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Related Experiment Videos

Constant time steady gradient NMR diffusometry using the secondary stimulated echo.

Elmar Fischer1, Rainer Kimmich

  • 1Sektion Kernresonanzspektroskopie, University of Ulm, 89069 Ulm, Germany. elmar.fischer@physik.uni-ulm.de

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|January 20, 2004
PubMed
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This study introduces a new pulse sequence for steady gradient spin echo diffusometry. The method accurately measures self-diffusion coefficients by isolating diffusion effects, even at low values.

Area of Science:

  • Magnetic Resonance Imaging
  • Materials Science
  • Physical Chemistry

Background:

  • Steady gradient spin echo diffusometry is affected by relaxation and dipolar interactions.
  • NMR magnets often produce strong fringe fields with steady gradients.
  • Accurate self-diffusion measurements are crucial in various materials.

Purpose of the Study:

  • To develop a novel pulse sequence for compensating relaxation and dipolar effects in diffusometry.
  • To enable accurate self-diffusion measurements in the presence of steady magnetic field gradients.
  • To achieve reliable measurements of self-diffusion coefficients at low values.

Main Methods:

  • A pulse sequence generating a second stimulated echo was designed.
  • The sequence keeps the absolute echo time constant while varying the interval between the first two radiofrequency pulses.

Related Experiment Videos

  • This modulation isolates self-diffusion effects on the echo amplitude.

    • Main Results:

    • The technique successfully compensates for relaxation and residual dipolar interactions.
    • It provides reliable data for time-dependent self-diffusion coefficients.
    • Accurate measurements were achieved down to approximately 10(-15)m(2)/s, near the physical limit.

    Conclusions:

    • The proposed single-scan/single-echo-signal method eliminates the need for reference signals.
    • This technique offers a robust approach for precise self-diffusion measurements in materials like poly(ethylene oxide) melts.
    • It extends the measurable range of self-diffusion coefficients significantly.