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Related Experiment Videos

Motional phase artifacts in Fourier transform MRI.

V J Wedeen1, R E Wendt, M Jerosch-Herold

  • 1Whitaker College, Massachusetts Institute of Technology, Cambridge 02138.

Magnetic Resonance in Medicine
|July 1, 1989
PubMed
Summary

Magnetic resonance imaging (MRI) suffers from motional blurring due to frequency-encoding gradients. Computer simulations reveal how this blurring impacts MRI signal acquisition and image quality.

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Area of Science:

  • Physics
  • Medical Imaging
  • Biophysics

Background:

  • Magnetic resonance imaging (MRI) is a crucial diagnostic tool.
  • Data acquisition in MRI is often complicated by motion artifacts.
  • Motional blurring is a significant challenge in achieving high-resolution MRI.

Purpose of the Study:

  • To investigate the phenomenon of motional blurring in MRI.
  • To understand the mathematical basis of motional blurring.
  • To visualize the effects of motional blurring using computational methods.

Main Methods:

  • Analysis of the Fourier transform of spin signals under magnetic field gradients.
  • Derivation of an equation analogous to the free space Schrödinger equation for moving spins.
  • Computer simulations of the Bloch equations to model motional blurring.

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Main Results:

  • The signal from a moving spin in a gradient field follows a Schrödinger-like equation.
  • Simulations demonstrate the detrimental effects of motional blurring on MRI data.
  • The extent of blurring is dependent on gradient strength and motion dynamics.

Conclusions:

  • Motional blurring is an inherent artifact in many MRI sequences.
  • Understanding the physics of motional blurring is key to developing mitigation strategies.
  • Computational modeling provides valuable insights into MRI signal degradation due to motion.