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Related Experiment Videos

Fluid shear and spin-echo images.

D O Kuethe1, R J Herfkens

  • 1Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710.

Magnetic Resonance in Medicine
|April 1, 1989
PubMed
Summary
This summary is machine-generated.

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Fluid shear, a cause of magnetic resonance imaging artifacts, can alter pixel intensities by up to 40% or reduce them to background levels. Understanding shear effects is crucial for accurate medical imaging.

Area of Science:

  • Medical Imaging
  • Fluid Dynamics

Background:

  • Clinical studies suggest fluid shear is a primary cause of magnetic resonance imaging (MRI) artifacts.
  • Differentiating shear effects from other motion artifacts is essential for improving image quality.

Purpose of the Study:

  • To develop and utilize an apparatus that isolates the impact of fluid shear on MRI.
  • To quantify the effects of shear-induced motion on pixel intensity in MRI.

Main Methods:

  • An experimental setup with fluid between two concentric cylinders was used.
  • Shear was induced by rotating the outer cylinder; motion without shear was achieved by rotating both cylinders together.
  • Shear rates up to 200 s-1, comparable to those in large arteries, were applied.

Main Results:

Related Experiment Videos

  • Shear rates of 200 s-1 caused pixel intensities to increase by 40% or decrease to background levels.
  • Intensity increases were observed when velocities aligned with the phase-encoding gradient.
  • Intensity decreases correlated with velocities parallel to the frequency gradient and phase dispersion within a voxel.

Conclusions:

  • Fluid shear significantly impacts MRI pixel intensities, leading to both signal enhancement and loss.
  • The observed signal changes are dependent on the orientation of fluid velocity relative to MRI gradients.
  • This study provides a foundation for mitigating shear-related artifacts in clinical MRI.