Cervical spinal cord MTR, MD, and FA histogram-derived metrics from a patient with Hirayama disease and age-matched healthy control subjects
| Control Subjects Mean (SD) | Normality Ranges (mean ± SD) | HD Patient | |
|---|---|---|---|
| Average MTR (%) | 35.3 (1.2) | 32.9–37.7 | 30.2 |
| Average MD (×10−3 mm2s−1) | 1.22 (0.08) | 1.06–1.38 | 1.44 |
| Average FA | 0.43 (0.03) | 0.37–0.49 | 0.32 |
Note:—MTR indicates magnetization transfer ratio; MD, mean diffusivity; FA, fractional anisotropy; HD, Hirayama disease.