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Related Experiment Videos

Measuring magnetic fields generated by DC currents in receive-only coils.

James N Lee1, J Rock Hadley, Michael C Steckner

  • 1University of Utah, School of Medicine, Department of Radiology, Salt Lake City 84132, USA. jim@doug.med.utah.edu

Magnetic Resonance Imaging
|December 7, 2002
PubMed
Summary

Direct current (DC) decoupling currents in MRI can generate stray magnetic fields that alter nuclear resonant frequencies. These fields, undetectable by standard methods, can be measured using cardiac tagging techniques.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biophysics

Background:

  • Radiofrequency (RF) transmission in MRI can induce direct current (DC) decoupling currents in receive-only coils.
  • These currents generate unwanted stray magnetic fields.
  • These fields can alter the resonant frequency of nearby nuclei, impacting image quality.

Purpose of the Study:

  • To investigate the impact of DC decoupling currents on stray magnetic fields in MRI.
  • To identify methods for measuring these transient stray magnetic fields.

Main Methods:

  • Empirical measurement of stray magnetic fields using cardiac tagging.
  • Analysis of the influence of DC currents on nuclear resonant frequencies.

Main Results:

  • DC decoupling currents create stray magnetic fields during RF transmission.

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  • These fields are not present during signal acquisition, complicating conventional measurement.
  • Cardiac tagging provides a viable method for empirical measurement of these stray fields.

    • Conclusions:

    • Stray magnetic fields from DC decoupling currents pose a challenge in MRI.
    • Cardiac tagging is a practical approach for characterizing these fields.
    • Understanding and mitigating these fields is crucial for maintaining MRI signal integrity.