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Methods for reconstructing phase sensitive slice profiles in magnetic resonance imaging

P Devoulon1, L Emsley, P Weber

  • 1Unité INSERM U318, Université Joseph Fourier, Hôpital Albert Michallon, Grenoble, France.

Magnetic Resonance in Medicine
|February 1, 1994
PubMed
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This study details methods for obtaining phase-sensitive slice profiles in Magnetic Resonance Imaging (MRI). These techniques improve the characterization of radiofrequency pulse performance for better imaging quality.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Pulse Sequence Design
  • Image Reconstruction

Background:

  • Experimental determination of slice profiles in MRI typically yields magnitude profiles, limiting detailed analysis.
  • Understanding the precise distribution of radiofrequency (RF) energy deposition is crucial for accurate slice selection.
  • Distinguishing between excitation and slice profiles is key for optimizing pulse sequences.

Purpose of the Study:

  • To discuss conditions for obtaining phase-sensitive slice profiles in MRI.
  • To present methods for acquiring both excitation and slice profiles.
  • To evaluate the performance of various RF pulse shapes using phase-sensitive techniques.

Main Methods:

  • Phase encoding along the slice selection gradient to acquire real and imaginary parts of the slice profile.

Related Experiment Videos

  • Frequency encoding to obtain the phase-sensitive excitation profile.
  • Experimental evaluation of different RF pulse shapes.

    • Main Results:

    • Demonstration of methods to obtain phase-sensitive excitation and slice profiles.
    • Phase encoding provides a convenient protocol for detailed slice profile analysis.
    • Successful evaluation of various RF pulse shapes using the developed phase-sensitive methods.

    Conclusions:

    • Phase-sensitive profile determination offers a more comprehensive understanding of RF pulse behavior in MRI.
    • The presented methods enhance the ability to characterize and optimize slice selection.
    • Accurate slice profile characterization is essential for improving MRI sequence performance and image fidelity.