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Related Experiment Videos

Gradient hysteresis in MRI and NMR experiments.

Brian J Nieman1, Jonathan Bishop, R Mark Henkelman

  • 1Mouse Imaging Centre, Hospital for Sick Children, Toronto, Ont., Canada. brian.nieman@sw.ca

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 29, 2005
PubMed
Summary

A gradient hysteresis effect impacts current in magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) coils. This study presents methods to evaluate phase changes and gradient pulse shape alterations caused by this effect.

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Area of Science:

  • Physics
  • Engineering
  • Biomedical Imaging

Background:

  • Gradient coils are crucial for spatial encoding in MRI and NMR.
  • Hysteresis effects in electronic components can introduce signal distortions.
  • Understanding current modulation in gradient coils is vital for image fidelity.

Purpose of the Study:

  • To describe and characterize a gradient hysteresis effect in MRI and NMR gradient coils.
  • To present a method for evaluating the impact of this effect on accumulated phase.
  • To analyze changes in gradient pulse shapes due to hysteresis.

Main Methods:

  • Implementation of a specific pulse sequence to measure phase changes.
  • Characterization of gradient pulse shape distortions.

Related Experiment Videos

  • Experimental evaluation of the gradient hysteresis effect.

    • Main Results:

    • Demonstration of a gradient hysteresis effect modulating coil current.
    • Quantification of phase shifts resulting from the hysteresis.
    • Description of the specific alterations in gradient pulse shapes.

    Conclusions:

    • The gradient hysteresis effect can significantly impact MRI and NMR experiments.
    • The presented pulse sequence effectively evaluates phase changes due to hysteresis.
    • Characterizing this effect is important for improving gradient performance and troubleshooting NMR artifacts.