Signal irreproducibility in high-field solution magnetic resonance experiments caused by spin turbulence.

Published

Journal Article

Turbulent spin dynamics arising from the joint action of radiation damping and the distant dipolar field are shown to generate irreproducible measurements in popular high-field, gradient-based magnetic resonance (MR) experiments, undermining the prevailing assumption of essentially predictable observables in MR. Sizeable fluctuations in echo amplitudes are reported and numerically simulated for pulsed gradient spin echo and stimulated echo diffusion measurements. The underlying microscopic dynamical instability is characterized by analysis of the finite-time Lyapunov exponents. Perturbations to the modulated magnetization are shown to render magic-angle gradients ineffective in suppressing signal fluctuations. Alternative approaches are suggested for cancelling out the feedback interactions leading to spin turbulence.

Full Text

Duke Authors

Cited Authors

  • Huang, SY; Walls, JD; Wang, Y; Warren, WS; Lin, Y-Y

Published Date

  • October 2004

Published In

Volume / Issue

  • 121 / 13

Start / End Page

  • 6105 - 6109

PubMed ID

  • 15446904

Pubmed Central ID

  • 15446904

Electronic International Standard Serial Number (EISSN)

  • 1089-7690

International Standard Serial Number (ISSN)

  • 0021-9606

Digital Object Identifier (DOI)

  • 10.1063/1.1802492

Language

  • eng