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A new method for variable temperature gradient shimming.

Clare-Louise Evans1, Gareth A Morris, Adrian L Davis

  • 1Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|February 16, 2002
PubMed
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Sample convection disrupts magnetic resonance imaging signals. A novel double spin-echo pulse sequence effectively corrects these errors, enabling reliable gradient shimming across various temperatures.

Area of Science:

  • Magnetic Resonance Imaging
  • Spectroscopy
  • Physical Chemistry

Background:

  • Sample convection is a significant source of signal attenuation in pulsed field gradient spin-echo (PFGSE) experiments.
  • This signal loss impedes accurate measurements, particularly in applications like gradient shimming.
  • Existing methods struggle to compensate for convection-induced phase errors, limiting experimental conditions.

Purpose of the Study:

  • To develop a new pulse sequence to overcome signal attenuation caused by sample convection.
  • To enable reliable gradient shimming in the presence of convection.
  • To facilitate PFGSE experiments under a wider range of temperatures.

Main Methods:

  • A novel class of double spin-echo pulse sequences was designed and implemented.

Related Experiment Videos

  • The proposed sequences incorporate elements to refocus phase errors induced by sample movement.
  • The effectiveness of the new sequences was evaluated in the context of gradient shimming.

    • Main Results:

    • The double spin-echo sequence successfully refocuses phase errors arising from sample convection.
    • Gradient shimming can be performed with high reliability using the new pulse sequences.
    • The method is effective over a broad spectrum of experimental temperatures.

    Conclusions:

    • The proposed double spin-echo pulse sequences provide a robust solution for mitigating convection artifacts in PFGSE experiments.
    • This advancement significantly improves the reliability of gradient shimming, especially at varying temperatures.
    • The technique broadens the applicability of PFGSE methods in scientific research.