Cited by 138Advanced Neuroimaging Techniques and ApplicationsFunctional Brain Connectivity StudiesAdvanced MRI Techniques and Applications

Microstructure informed tractography: pitfalls and open challenges

Open access
Daducci, Alessandro, Dal Palú, Alessandro, Descoteaux, Maxime, Thiran, Jean-Philippe·2016·Frontiers in Neuroscience

Abstract

One of the major limitations of diffusion MRI tractography is that the fiber tracts recovered by existing algorithms are not truly quantitative. Local techniques for estimating more quantitative features of the tissue microstructure exist, but their combination with tractography has always been considered intractable. Recent advances in local and global modeling made it possible to fill this gap and a number of promising techniques for microstructure informed tractography have been suggested, opening new and exciting perspectives for the quantification of brain connectivity. The ease-of-use of the proposed solutions made it very attractive for researchers to include such advanced methods in their analyses; however, this apparent simplicity should not hide some critical open questions raised by the complexity of these very high-dimensional problems, otherwise some fundamental issues may be pushed into the background. The aim of this article is to raise awareness in the diffusion MRI community, notably researchers working on brain connectivity, about some potential pitfalls and modeling choices that make the interpretation of the outcomes from these novel techniques rather cumbersome. Through a series of experiments on synthetic and real data, we illustrate practical situations where erroneous and severely biased conclusions may be drawn about the connectivity if these pitfalls are overlooked, like the presence of partial/missing/duplicate fibers or the critical importance of the diffusion model adopted. Microstructure informed tractography is a young but very promising technology, and by acknowledging its current limitations as done in this paper, we hope our observations will trigger further research in this direction and new ideas for truly quantitative and biologically meaningful analyses of the connectivity.

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Crossref · 10.3389/fnins.2016.00247

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  • Structural connectome analyses are most convincing when integrated with neuroanatomical knowledge, functional data, and careful control of tractography biases.

    “Structural connectome analyses are most convincing when integrated with neuroanatomical knowledge, functional data, and careful control of tractography biases (Assaf et al., 2019; Daducci et al., 2016).”

    From 40 Years of diffusion MRI in the brain: From history to emerging frontiers (2026) · cites this paper as Daducci et al., 2016

    Section 3.2 (Biological plausibility; page unavailable) recommends comparing tractography estimates with known anatomy, while the Introduction and Section 5 warn that overlooked tractography pitfalls can bias connectivity analyses. The passages do not recommend integrating structural analyses with functional data; a search for functional MRI, functional data, and functional connectivity found no supporting passage. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Higher angular-resolution methods, better distortion correction, and anatomically informed tractography improve matters, yet they do not eliminate the inverse problem.

    “Higher angular-resolution methods, better distortion correction, and anatomically informed tractography improve matters, yet they do not eliminate the inverse problem (Daducci et al., 2016; Tournier et al., 2011).”

    From 40 Years of diffusion MRI in the brain: From history to emerging frontiers (2026) · cites this paper as Daducci et al., 2016

    Section 5 (Discussion and conclusion; page unavailable) says anatomical constraints and careful handling of partial fibers matter, but global methods can still overfit and yield anatomically implausible results. Section 4.1 discusses correction of signal-intensity inhomogeneity, not distortion correction. The paper does not establish that higher angular resolution or better distortion correction improves tractography while leaving the inverse problem unresolved. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • White matter fibers synapse in the gray matter.

    “despite the fact that white matter fibers synapse in the gray matter (Daducci et al., 2016)”
  • Tractography visualizes a model of anatomical connectivity constrained by diffusion data, not anatomy itself.

    “Tractography, therefore, visualizes a model of anatomical connectivity constrained by diffusion data, not anatomy itself (Daducci et al., 2016; Tournier et al., 2011).”

    From 40 Years of diffusion MRI in the brain: From history to emerging frontiers (2026) · cites this paper as Daducci et al., 2016

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Authors
Daducci, A., Dal Palú, A., Descoteaux, M., & Thiran, J.-P.
Affiliations
  • Université de Sherbrooke (CA)
  • Centre Hospitalier Universitaire Vaudois (CH)
Corresponding author
Daducci, Alessandro
Venue
Frontiers in Neuroscience
Published
2016-06-06
Volume
10
Pages
247-247
ISSN
1662-453X (ISSN-L)
OpenAlex
W2404527239
Cited by
138
References
51
Citations by year
2026: 9 · 2025: 17 · 2024: 9 · 2023: 8 · 2022: 8 · 2021: 12 · 2020: 14 · 2019: 23 · 2018: 16 · 2017: 21 · 2016: 1
FWCI
17.65
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Neuroscience (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
  • Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion)
  • Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion, cc-by-nc-nd)
  • Figshare (cc-by)
Funders
  • École Polytechnique Fédérale de Lausanne
  • Centre d'Imagerie BioMédicale
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced MRI Techniques and Applications
Keywords
diffusion MRI, brain connectivity

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