Abstract
Purpose
In diffusion MRI (dMRI), it remains unclear to know how much increase of b-value is conveying additional biological meaning. We tested the correlations between cortical microarchitecture and diffusion metrics computed from standard (1000 s/mm2), high (3000 s/mm2), to very high (5000 s/mm2) b-value dMRI.
Methods
Healthy volunteers were scanned with a dMRI pulse sequence that was first optimized together with a T1-WI and T2-WI. Averaged cortical surface map of estimated myelin (T1-WI/T2-WI) was compared with surface maps of mean diffusivity (MD) computed from each b-value (MD1000, MD3000, and MD5000) and to surface map of mean kurtosis (MK computed from the 0-, 1000-, to 3000-s/mm2 shells) in 360 cortical parcels using Spearman correlations, multiple linear regressions, and Akaike information criteria (AIC).
Results
Surface map from MD1000 showed variations not related to myelin but the MD3000 and MD5000 maps inversely mirrored estimated myelin map; lower MD values being observed in more myelinated cortical areas. MK mirrored myelinated cortical areas. Quantitatively, Spearman correlations between myelin and MD became more and more negative as long as b-values increased while the correlation was positive between myelin and MK. Multiple regression models confirmed negative associations between myelin and MD that were significantly better from MD1000 to MD3000 and MD5000 (R2 = 0.33, p < 0.001; R2 = 0.43, p < 0.001; and R2 = 0.50, p < 0.001) and positive association between myelin and MK (R2 = 0.53, p < 0.001). Comparisons of the 3 statistical models showed the best performances with MK and MD5000 (AICMK < AICMD5000 < AICMD3000 < AICMD1000).
Conclusion
Higher b-values are more closely related to subtle cellular variations of the cortical microarchitecture.
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Funding information
The study was supported by public grants from the French Agence Nationale de la Recherche within the context of the Investments for the Future Program, referenced ANR-10-LABX-57 and named “TRAIL” (Translational Research and Advanced Imaging Laboratory).
Abbreviations
- AIC:
-
Akaike information criterion
- dMRI:
-
Diffusion magnetic resonance imaging
- DKI:
-
Diffusion kurtosis imaging
- DTI:
-
Diffusion tensor imaging
- FA:
-
Fractional anisotropy
- HCP:
-
Human connectome project
- MD:
-
Mean diffusivity
- MK:
-
Mean kurtosis
- NAq:
-
Number of acquisitions
- NDGD:
-
Number of diffusion gradient directions
- NODDI:
-
Neurite orientation dispersion and density imaging
- SS-EPI:
-
Single-shot echo-planar imaging
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Contributions
Mournet, S., University Hospital of Bordeaux, France, analyzed the data; performed biostatistical analyses; interpreted the data; and drafted the manuscript for intellectual content.
Okubo, G., University Hospital of Bordeaux, France, designed and conceptualized the study; collected the data; computed surface maps; and revised the manuscript critically for intellectual content.
Koubiyr, I., University Hospital of Bordeaux, France, participated to image postprocessing and revised the manuscript critically for intellectual content.
Zhang, B., Canon Medical System, coordinated imaging acquisition for site, played a major role in the acquisition of data, and revised the manuscript critically for intellectual content.
Kusahara, H., Canon Medical System, played a major role in the elaboration of the diffusion sequence and revised the manuscript critically for intellectual content.
Prevost, V.H., Canon Medical System, participated to sequence optimization and revised the manuscript critically for intellectual content.
Ichinose, N., Canon Medical System, coordinated imaging acquisition for site; participated to sequence optimization; and revised the manuscript critically for intellectual content.
Triaire, B., Canon Medical System, coordinated imaging acquisition for site and revised the manuscript critically for intellectual content.
Hiba, B., University Hospital of Lyon, France, played a role in the acquisition of data and revised the manuscript critically for intellectual content.
Dousset, V., University Hospital of Bordeaux, France, designed and conceptualized study and revised the manuscript critically for intellectual content.
Tourdias, T., University Hospital of Bordeaux, France, designed and conceptualized study; interpreted the data; and drafted the manuscript for intellectual content.
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Zhang B, Kusahara H, Prevost V.H, Ichinose N and Triaire B are employees for Canon Medical.
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All procedures performed in the studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Supplemental Figure 1:
(a) Cortical surface maps with black lines representing the HCP cortical parcellation. Yellow parcels correspond to the 72 thinnest cortical parcels. There are four views of the brain: left lateral (top left), left medial (bottom left), right lateral (top right) and right medial (bottom right). (b) MD within the 72 thinnest parcels along spatial resolution. Values are means ± standard error to the mean (SEM) and are normalized to the mean value at 1.3mm3 resolution. (c) MD and (d) FA within the 72 thinnest parcels along NDGD. Values are means ± SEM and are normalized to the mean value collected with 64 NDGD. ** p<0.01 and *** p<0.001 for Nemenyi post hoc tests with Bonferroni correction. (JPG 171 kb).
Supplemental Figure 2:
The left lateral view of the cortical surface maps averaged across the 9 subjects for MD1000, MD3000 and MD5000 showing a progressive decrease of MD along b-values (top line) but also, when window/level was adjusted individually, variations of MD values from one cortical area to another with different patterns according to b-values (bottom line). (PNG 1223 kb).
Supplemental Figure 3:
Left lateral view of the brain of cortical surface maps averaged across the 9 subjectsfor (a) FA1000, (b) FA3000, and (c) FA5000. (JPG 160 kb).
Supplemental Table 1:
details of MR sequence parameters and post-processing steps. (PDF 83 kb).
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Mournet, S., Okubo, G., Koubiyr, I. et al. Higher b-values improve the correlation between diffusion MRI and the cortical microarchitecture. Neuroradiology 62, 1411–1419 (2020). https://doi.org/10.1007/s00234-020-02462-4
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DOI: https://doi.org/10.1007/s00234-020-02462-4