Cited by 188Advanced Neuroimaging Techniques and ApplicationsMultiple Sclerosis Research StudiesAdvanced MRI Techniques and Applications

In vivo quantification of demyelination and recovery using compartment-specific diffusion MRI metrics validated by electron microscopy

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Jelescu, Ileana O., Zurek, Magdalena, Winters, Kerryanne V., Veraart, Jelle, Rajaratnam, Anjali, Kim, Nathanael S., Babb, James S., Shepherd, Timothy M. +3 more·2016·NeuroImage

Abstract

There is a need for accurate quantitative non-invasive biomarkers to monitor myelin pathology in vivo and distinguish myelin changes from other pathological features including inflammation and axonal loss. Conventional MRI metrics such as T2, magnetization transfer ratio and radial diffusivity have proven sensitivity but not specificity. In highly coherent white matter bundles, compartment-specific white matter tract integrity (WMTI) metrics can be directly derived from the diffusion and kurtosis tensors: axonal water fraction, intra-axonal diffusivity, and extra-axonal radial and axial diffusivities. We evaluate the potential of WMTI to quantify demyelination by monitoring the effects of both acute (6weeks) and chronic (12weeks) cuprizone intoxication and subsequent recovery in the mouse corpus callosum, and compare its performance with that of conventional metrics (T2, magnetization transfer, and DTI parameters). The changes observed in vivo correlated with those obtained from quantitative electron microscopy image analysis. A 6-week intoxication produced a significant decrease in axonal water fraction (p<0.001), with only mild changes in extra-axonal radial diffusivity, consistent with patchy demyelination, while a 12-week intoxication caused a more marked decrease in extra-axonal radial diffusivity (p=0.0135), consistent with more severe demyelination and clearance of the extra-axonal space. Results thus revealed increased specificity of the axonal water fraction and extra-axonal radial diffusivity parameters to different degrees and patterns of demyelination. The specificities of these parameters were corroborated by their respective correlations with microstructural features: the axonal water fraction correlated significantly with the electron microscopy derived total axonal water fraction (ρ=0.66; p=0.0014) but not with the g-ratio, while the extra-axonal radial diffusivity correlated with the g-ratio (ρ=0.48; p=0.0342) but not with the electron microscopy derived axonal water fraction. These parameters represent promising candidates as clinically feasible biomarkers of demyelination and remyelination in the white matter.

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Crossref · 10.1016/j.neuroimage.2016.02.004

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  • NDI is a surrogate index equivalent to NSF/(1-MSF).

    “This finding is not surprising as NDI is a surrogate index equivalent to NSF/(1–MSF)26, 43 (post hoc analysis confirms a correlation between these two measures).”

    From Neurite dispersion: a new marker of multiple sclerosis spinal cord pathology? (2017) · cites this paper as [43]

    The Introduction describes axonal water fraction (AWF), and Methods §2.4 gives an analogous calculation, tAWF = tAVF/(1 − MVF). Neither passage establishes that NDI is equivalent to NSF/(1 − MSF); searches for that expression and its component terms found no passage addressing the claimed equivalence. Page numbers were unavailable in our copy. (LLM, conf=0.72)

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  1. Gareau PJ Rutt BK Karlik SJ Mitchell JR 2000 Magnetization transfer and multicomponent T2 relaxation measurements with histopathologic correlation in an experimental model of MS J Magn Reson Imaging 11 586 595 10862056

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Authors
Jelescu, I. O., Zurek, M., Winters, K. V., Veraart, J., Rajaratnam, A., Kim, N. S., Babb, J. S., Shepherd, T. M., Novikov, D. S., Kim, S. G., & Fieremans, E.
Affiliations
  • NYU Langone Health (US)
  • New York University (US)
Corresponding author
Jelescu, Ileana O.
Venue
NeuroImage
Publisher
Elsevier BV
Published
2016-05
Volume
132
Pages
104-114
ISSN
1053-8119 (ISSN-L)
OpenAlex
W2269202100
Cited by
188
References
55
Citations by year
2026: 12 · 2025: 19 · 2024: 23 · 2023: 11 · 2022: 14 · 2021: 22 · 2020: 21 · 2019: 17 · 2018: 19 · 2017: 20 · 2016: 10
FWCI
19.10
Type
journal article
Language
en
Open access
Locations
  • NeuroImage (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • NINDS (R21 NS081230, R01 NS088040)
  • NCATS (UL1 TR00038)
  • Raymond and Beverly Sackler Laboratories for the Convergence of Biomedical, Physical, and Engineering Sciences
  • Center of Advanced Imaging Innovation and Research (P41 EB017183)
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Multiple Sclerosis Research Studies
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced MRI Techniques and Applications
Keywords
demyelination, remyelination, white matter tract integrity, corpus callosum, g-ratio, white matter microstructure
MeSH terms
Remyelination, Animals, Brain Mapping, Corpus Callosum, Cuprizone, Demyelinating Diseases, Diffusion, Female, Mice, Inbred C57BL, Microscopy, Electron, Myelin Sheath, Diffusion Magnetic Resonance Imaging, Diffusion Tensor Imaging

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