Cited by 82Advanced Neuroimaging Techniques and ApplicationsDementia and Cognitive Impairment ResearchAlzheimer's disease research and treatments

Fractional anisotropy changes in Alzheimer’s disease depend on the underlying fiber tract architecture: a multiparametric DTI study using joint independent component analysis

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Teipel, Stefan J., the EDSD study group, Grothe, Michel J., Filippi, Massimo, Fellgiebel, Andreas, Dyrba, Martin, Frisoni, Giovanni B., Meindl, Thomas +4 more·2014·Journal of Alzheimer s Disease

Abstract

Diffusion tensor imaging (DTI) allows the simultaneous measurement of several diffusion indices that provide complementary information on the substrate of white matter alterations in neurodegenerative diseases. These indices include fractional anisotropy (FA) as measure of fiber tract integrity, and the mode of anisotropy (Mode) reflecting differences in the shape of the diffusion tensor. We used a multivariate approach based on joint independent component analysis of FA and Mode in a large sample of 138 subjects with Alzheimer's disease (AD) dementia, 37 subjects with cerebrospinal fluid biomarker positive mild cognitive impairment (MCI-AD), and 153 healthy elderly controls from the European DTI Study on Dementia to comprehensively study alterations of microstructural white matter integrity in AD dementia and predementia AD. We found a parallel decrease of FA and Mode in intracortically projecting fiber tracts, and a parallel increase of FA and Mode in the corticospinal tract in AD patients compared to controls. Subjects with MCI-AD showed a similar, but spatially more restricted pattern of diffusion changes. Our findings suggest an early axonal degeneration in intracortical projecting fiber tracts in dementia and predementia stages of AD. An increase of Mode, parallel to an increase of FA, in the corticospinal tract suggests a more linear shape of diffusion due to loss of crossing fibers along relatively preserved cortico-petal and cortico-fugal fiber tracts in AD. Supporting this interpretation, we found three populations of fiber tracts, namely cortico-petal and cortico-fugal, commissural, and intrahemispherically projecting fiber tracts, in the peak area of parallel FA and Mode increase.

Integrity signals

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Crossref · 10.3233/jad-131829

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  • DTI alterations observed in the corticospinal tract in the current study cannot be unambiguously attributed to that tract and may be due to alterations in crossing fibres such as the superior longitudinal fasciculus or corpus callosum.

    “DTI alterations such as those observed in the corticospinal tract in the current study should be interpreted with caution, as the current TBSS approach cannot be unambiguously attributed to that tract, but potentially are because of alterations in crossing fibres such as the superior longitudinal fasciculus or corpus callosum (Douaud et al., 2011; Teipel et al., 2014; Mito et al., 2018).”
  • Voxel-based analysis utilising DTI models does not adequately estimate orientationally-sensitive diffusivity measures such as axial and radial diffusivity (AD and RD).

    “Therefore, apart from the limited area of white matter occupied by coherent fiber tracts, voxel-based analysis utilising DTI models does not adequately estimate orientationally-sensitive diffusivity measures, such as axial and radial diffusivity (AD and RD) [12, 13].”

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Authors
Teipel, S. J., the EDSD study group, Grothe, M. J., Filippi, M., Fellgiebel, A., Dyrba, M., Frisoni, G. B., Meindl, T., Bokde, A. L. W., Hampel, H., Klöppel, S., & Hauenstein, K.
Affiliations
  • German Center for Neurodegenerative Diseases (DE)
  • University of Rostock (DE)
  • Vita-Salute San Raffaele University (IT)
  • University of Geneva (CH)
  • Trinity College Dublin (IE)
  • Goethe University Frankfurt (DE)
  • University Medical Center Freiburg (DE)
Venue
Journal of Alzheimer s Disease
Published
2014-06-04
Volume
41
Issue
1
Pages
69-83
ISSN
  • 1387-2877 (ISSN-L)
  • 1875-8908
OpenAlex
W1527867630
Cited by
82
References
50
Citations by year
2026: 5 · 2025: 6 · 2024: 4 · 2023: 5 · 2022: 3 · 2021: 6 · 2020: 5 · 2019: 10 · 2018: 10 · 2017: 8 · 2016: 6 · 2015: 8 · 2014: 6
FWCI
7.29
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Journal of Alzheimer s Disease (publishedVersion)
  • PubMed (publishedVersion)
  • Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by)
  • Archivio Istituzionale della Ricerca - Università Vita-Salute San Raffaele (submittedVersion)
  • DZNE Pub (submittedVersion)
Funders
Japan International Cooperation Agency
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
Alzheimer's disease, fractional anisotropy
MeSH terms
Aged, Alzheimer Disease, Axons, Brain, Europe, Female, Humans, Image Processing, Computer-Assisted, Male, Nerve Degeneration, Nerve Fibers, Myelinated, Pyramidal Tracts, Anisotropy, Disease Progression, Diffusion Magnetic Resonance Imaging, Early Diagnosis, Diffusion Tensor Imaging, Cognitive Dysfunction, White Matter

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