Abstract
Background
White matter (WM) atrophy is relevant in multiple sclerosis (MS), but the methods of analysis currently used are not specific for microstructural changes. The aims of this study were to assess the use of advanced diffusion-weighted imaging (DWI) techniques proposed as measures of baseline and longitudinal WM atrophy in MS and to analyze whether these measures helped explain MS clinical disability (including cognitive impairment) better than volumetric and diffusion tensor (DT)-derived measures.
Methods
3DT1-weighted and DWI sequences were applied to 86 MS and 55 healthy controls (HC) at baseline and after one-year. Intra-cellular volume (vic) maps were computed from neurite orientation dispersion and density imaging model. Voxel-wise fiber-bundle cross-section (FCS) atrophy in MS compared to HC was estimated. Maps of fractional anisotropy and mean diffusivity were also obtained from DWI for a comparison with the proposed advanced DW-derived measures (vic and FCS).
Results
Both at baseline and after 1-year, only FCS measure showed a significant atrophy in relapsing–remitting (RR) MS compared to HC and in progressive MS compared to RRMS, mainly located in specific WM tracts (corticospinal tract, splenium of the corpus callosum, left optic radiation, bilateral cingulum, middle cerebellar peduncle and anterior commissure, p value < 0.05). Global baseline FCS and vic were the selected predictors of clinical (R-sq = 0.33, p = 0.007) and cognitive scores (R-sq = 0.29, p = 0.0014) in a linear regression model.
Conclusion
Voxel-based FCS was able to detect WM tracts atrophy in MS clinical phenotypes with greater anatomical specificity compared to other measures (volumetric and DT-derived measures of WM damage). FCS and vic measured at baseline in the WM were the best predictors of clinical disability and cognitive impairment.
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Acknowledgements
This study was partially supported by Fondazione Italiana Sclerosi Multipla with a research fellowship (FISM 2019/BR/009) and a research Grant (FISM2018/R/16), and financed or co-financed with the ‘5 per mille’ public funding.
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LS, EP, MF and MAR contributed to the conception and design of the study. LS, EP, AM, PP contributed to the acquisition and analysis of data. LS, EP, AM, PP contributed to drafting the text and preparing the figures. All the authors contributed to revising the manuscript and gave their approval to its current version.
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L. Storelli, E. Pagani, and A. Meani have nothing to disclose. P. Preziosa received speaker honoraria from Biogen Idec, Novartis, Bristol Myers Squibb, Genzyme and ExceMED. He is supported by a senior research fellowship FISM—Fondazione Italiana Sclerosi Multipla—cod. 2019/BS/009 and financed or co-financed with the ‘5 per mille’ public funding. Prof. Filippi is Editor-in-Chief of the Journal of Neurology, Associate Editor of Human Brain Mapping, Associate Editor of Radiology, and Associate Editor of Neurological Sciences; received compensation for consulting services and/or speaking activities from Alexion, Almirall, Bayer, Biogen, Celgene, Eli Lilly, Genzyme, Merck-Serono, Novartis, Roche, Sanofi, Takeda, and Teva Pharmaceutical Industries; and receives research support from Biogen Idec, Merck-Serono, Novartis, Roche, Teva Pharmaceutical Industries, Italian Ministry of Health, Fondazione Italiana Sclerosi Multipla, and ARiSLA (Fondazione Italiana di Ricerca per la SLA). Prof. M.A. Rocca received speaker honoraria from Bayer, Biogen, Bristol Myers Squibb, Celgene, Genzyme, Merck Serono, Novartis, Roche, and Teva, and receives research support from the MS Society of Canada and Fondazione Italiana Sclerosi Multipla.
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The ethics committee of IRCCS Ospedale San Raffaele approved the research protocol and the study was conducted in accordance with the principles of the Declaration of Helsinki.
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Storelli, L., Pagani, E., Meani, A. et al. Advanced diffusion-weighted imaging models better characterize white matter neurodegeneration and clinical outcomes in multiple sclerosis. J Neurol 269, 4729–4741 (2022). https://doi.org/10.1007/s00415-022-11104-z
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DOI: https://doi.org/10.1007/s00415-022-11104-z