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