MRI BIOPHYSICS GROUP

bridging the micro-macro gap with diffusion MRI

On modeling.

TitleOn modeling.
Publication TypeJournal Article
Year of Publication2018
AuthorsNovikov, DS, Kiselev, VG, Jespersen, SN
JournalMagn Reson Med
Volume79
Pagination3172–3193
Date PublishedJun
ISSN1522-2594 (Electronic); 0740-3194 (Linking)
Keywordsfunctional form, Microstructure, model, representation, validation
Abstract

Mapping tissue microstructure with MRI holds great promise as a noninvasive window into tissue organization at the cellular level. Having originated within the realm of diffusion NMR in the late 1970s, this field is experiencing an exponential growth in the number of publications. At the same time, model-based approaches are also increasingly incorporated into advanced MRI acquisition and reconstruction techniques. However, after about two decades of intellectual and financial investment, microstructural mapping has yet to find a single commonly accepted clinical application. Here, we suggest that slow progress in clinical translation may signify unresolved fundamental problems. We outline such problems and related practical pitfalls, as well as review strategies for developing and validating tissue microstructure models, to provoke a discussion on how to bridge the gap between our scientific aspirations and the clinical reality. We argue for recalibrating the efforts of our community toward a more systematic focus on fundamental research aimed at identifying relevant degrees of freedom affecting the measured MR signal. Such a focus is essential for realizing the truly revolutionary potential of noninvasive three-dimensional in vivo microstructural mapping.

DOI10.1002/mrm.27101
PubMed ID29493816
Research Category: 

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