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Related Experiment Videos

Signal-to-noise in phase angle reconstruction: dynamic range extension using phase reference offsets.

T E Conturo1, G D Smith

  • 1Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee 37232.

Magnetic Resonance in Medicine
|September 1, 1990
PubMed
Summary

Phase-reconstructed magnetic resonance imaging (MRI) offers a significantly wider dynamic range than magnitude-reconstructed MRI. A new technique enhances phase signal-to-noise ratio by over twofold, improving MRI quality.

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Area of Science:

  • Medical Imaging
  • Physics
  • Biophysics

Background:

  • Magnitude-reconstructed magnetic resonance images (MRIs) have limitations in dynamic range.
  • Phase-reconstructed MRIs offer a potentially wider dynamic range but require careful noise analysis.

Purpose of the Study:

  • To compare the dynamic range of phase-reconstructed MRIs with magnitude-reconstructed MRIs.
  • To analyze phase angle noise and its relationship to magnitude noise in MRIs.
  • To introduce and validate a novel technique for correcting phase spillover and extending dynamic range.

Main Methods:

  • Error propagation analysis was used to determine phase angle noise characteristics.
  • Phase-reconstructed and magnitude-reconstructed MRI data were compared.
  • An artifact-free technique for phase spillover correction was developed and applied.

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  • Experimental verification was performed to confirm theoretical findings.

    • Main Results:

    • Phase angle noise in MRIs is phase-independent and directly related to the noise-to-signal ratio of the magnitude image.
    • The theoretical dynamic range of phase angles is 2π times that of the signal magnitude.
    • The developed phase spillover correction technique is artifact-free.
    • Spillover correction extended phase signal-to-noise by over twofold in a flow study, reaching 15 times that of the magnitude signal-to-noise.

    Conclusions:

    • Phase-reconstructed MRI inherently possesses a greater dynamic range than magnitude-reconstructed MRI.
    • The presented artifact-free phase spillover correction method significantly enhances phase signal-to-noise ratio, improving MRI utility.
    • The findings validate theoretical models and demonstrate practical improvements in MRI acquisition and reconstruction.