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Flow effects in long-range dipolar field MRI.

Paulo Loureiro de Sousa1, Daniel Gounot, Daniel Grucker

  • 1Institut de Physique Biologique, Université Louis Pasteur, UMR 7004-CNRS, 4, rue Kirschléger, Strasbourg Cedex 67085, France. loureiro@ipb.u-strasbg.fr

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|June 18, 2003
PubMed
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Multiple spin echo (MSE) experiments are sensitive to fluid flow, which can alter signal intensity and dipolar interactions. Our study demonstrates how flow impacts MSE signals, revealing unexpected interactions under specific conditions.

Area of Science:

  • Magnetic Resonance Imaging
  • Spin Physics
  • Fluid Dynamics

Background:

  • Incoherent spin motion (diffusion) causes signal loss in multiple spin echo (MSE) experiments.
  • Coherent spin motion (laminar flow) influences magnetization and contrast in MSE imaging.

Purpose of the Study:

  • To investigate the flow sensitivity of MSE experiments.
  • To analyze how fluid flow affects dipolar field interactions in MSE.
  • To quantify the impact of motion on the nonlinear Bloch equation.

Main Methods:

  • Experimental validation of MSE flow sensitivity.
  • Theoretical analysis of dipolar field deformation by flow.
  • Numerical solution of the nonlinear Bloch equation.

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Main Results:

  • MSE experiments confirm sensitivity to fluid flow.
  • Fluid flow can annihilate the effect of distant dipolar fields.
  • Unexpected recovery of dipolar interactions observed due to flow under magic angle conditions.

Conclusions:

  • Fluid flow significantly impacts MSE signal intensity and contrast.
  • Flow-induced modifications to the dipolar field can be quantified.
  • MSE is a valuable technique for studying fluid motion and its effects on spin dynamics.