Conventions and nomenclature for double diffusion encoding NMR and MRI

Noam Shemesh*, Sune N. Jespersen, Daniel C. Alexander, Yoram Cohen, Ivana Drobnjak, Tim B. Dyrby, Jurgen Finsterbusch, Martin A. Koch, Tristan Kuder, Fredrik Laun, Marco Lawrenz, Henrik Lundell, Partha P. Mitra, Markus Nilsson, Evren Özarslan, Daniel Topgaard, Carl Fredrik Westin

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

Abstract

Stejskal and Tanner's ingenious pulsed field gradient design from 1965 has made diffusion NMR and MRI the mainstay of most studies seeking to resolve microstructural information in porous systems in general and biological systems in particular. Methods extending beyond Stejskal and Tanner's design, such as double diffusion encoding (DDE) NMR and MRI, may provide novel quantifiable metrics that are less easily inferred from conventional diffusion acquisitions. Despite the growing interest on the topic, the terminology for the pulse sequences, their parameters, and the metrics that can be derived from them remains inconsistent and disparate among groups active in DDE. Here, we present a consensus of those groups on terminology for DDE sequences and associated concepts. Furthermore, the regimes in which DDE metrics appear to provide microstructural information that cannot be achieved using more conventional counterparts (in a model-free fashion) are elucidated. We highlight in particular DDE's potential for determining microscopic diffusion anisotropy and microscopic fractional anisotropy, which offer metrics of microscopic features independent of orientation dispersion and thus provide information complementary to the standard, macroscopic, fractional anisotropy conventionally obtained by diffusion MR. Finally, we discuss future vistas and perspectives for DDE.

Original languageEnglish
Pages (from-to)82-87
Number of pages6
JournalMagnetic Resonance in Medicine
Volume75
Issue number1
DOIs
StatePublished - 1 Jan 2016

Keywords

  • diffusion
  • diffusion mri
  • double diffusion encoding
  • double pfg
  • double wave vector
  • microstructure

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