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Auxiliary phase encoding in multi spin-echo sequences: application to rapid current density imaging.

Igor Sersa1

  • 1Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia. igor.sersa@ijs.si

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|November 6, 2007
PubMed
Summary

This study introduces a two-shot RARE method for accurate phase mapping in magnetic resonance imaging. This technique enables faster current density imaging by precisely measuring magnetic field changes.

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Area of Science:

  • Magnetic Resonance Imaging
  • Physics
  • Electrical Engineering

Background:

  • Multi spin-echo sequences like single-shot RARE are sensitive to initial transverse magnetization phase.
  • Accurate phase mapping requires summing two RARE experiments with 90-degree phase shifts.
  • This is crucial for auxiliary phase encoding, including flow, displacement, susceptibility, pH, or temperature.

Purpose of the Study:

  • To present and validate a two-shot RARE approach for error-free phase mapping.
  • To demonstrate the application of this method for rapid current density imaging (CDI).
  • To offer a faster alternative to standard spin-echo based CDI for magnetic field mapping.

Main Methods:

  • Theoretical verification of the two-shot RARE sequence.
  • Experimental validation using electric current-induced magnetic fields.
  • Integration of electric pulse preparation with RARE acquisition for CDI.

Main Results:

  • The two-shot RARE method successfully generates error-free phase maps of initial transverse magnetization.
  • The proposed CDI method achieves significantly faster magnetic field change mapping compared to conventional techniques.
  • Demonstrated feasibility of mapping magnetic field changes induced by electric currents.

Conclusions:

  • The two-shot RARE approach provides accurate phase mapping essential for advanced MRI applications.
  • This method significantly enhances the speed and efficiency of current density imaging.
  • The technique offers a valuable tool for non-invasive measurement of electric currents in various samples.