NMR diffusion-encoding with axial symmetry and variable anisotropy: Distinguishing between prolate and oblate microscopic diffusion tensors with unknown orientation distribution.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

We introduce a nuclear magnetic resonance method for quantifying the shape of axially symmetric microscopic diffusion tensors in terms of a new diffusion anisotropy metric, DΔ, which has unique values for oblate, spherical, and prolate tensor shapes. The pulse sequence includes a series of equal-amplitude magnetic field gradient pulse pairs, the directions of which are tailored to give an axially symmetric diffusion-encoding tensor b with variable anisotropy bΔ. Averaging of data acquired for a range of orientations of the symmetry axis of the tensor b renders the method insensitive to the orientation distribution function of the microscopic diffusion tensors. Proof-of-principle experiments are performed on water in polydomain lyotropic liquid crystals with geometries that give rise to microscopic diffusion tensors with oblate, spherical, and prolate shapes. The method could be useful for characterizing the geometry of fluid-filled compartments in porous solids, soft matter, and biological tissues.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • CR Development AB
  • Linköping University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Radiologi och bildbehandling
Originalspråkengelska
Artikelnummer104201
TidskriftJournal of Chemical Physics
Volym142
Utgivningsnummer10
StatusPublished - 2015
PublikationskategoriForskning
Peer review utfördJa

Relaterad forskningsoutput

Eriksson, S., 2016, Lund: Lund University, Faculty of Science, Center for Chemistry and Chemical Engineering. 131 s.

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

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