Table 1.
Summary dMRI measurements (mean ± standard deviation) of the intraorbital optic nerve in healthy volunteers (n = 7 subjects × 2 nerves) from this study and those of Naismith et al. 2009 (n = 12) and Chang et al. 2014 (n = 22), as well as age distribution, mean (range) or mean ± standard deviation years. Diffusivity values are in unit of µm2/ms and FA and anisotropic fraction values are unitless.
| Age | This study (n = 7) 31 (23–41) |
Naismith 2009 (n = 12) 37 (21–49) |
Chang 2014 (n = 22) 59 ± 10 |
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|---|---|---|---|---|---|
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| DTI | DTI (FWE) | DBSI (fiber compartment) | DTI | DTI | |
| AD | 1.45 ± 0.23 | 1.38 ± 0.15 | 1.79 ± 0.11 | 1.66 ± 0.18 | 1.42 ± 0.5 |
| RD | 0.60 ± 0.15 | 0.33 ± 0.06 | 0.22 ± 0.06 | 0.81 ± 0.26 | 0.71 ±0.5 |
| MD | 0.82 ± 0.16 | 0.68 ± 0.07 | N/A | 1.09 ± 0.21 | 0.91 ± 0.3 |
| FA | 0.60 ± 0.08 | 0.73 ± 0.06 | 0.86 ± 0.04 | 0.43 ± 0.15 | 0.44 ± 0.2 |
| anisotropic fraction | N/A | 0.77 ± 0.05 | 0.64 ± 0.10 | N/A | N/A |