Table 4. Diffusion tensor imaging (DTI) descriptive statistics of axial diffusivity, fractional anisotropy and mean diffusivity per tract, per group.
| Mean (S.D) | ||||||
|---|---|---|---|---|---|---|
| Tract | AD | FA | MD | |||
| HC | PD | HC | PD | HC | PD | |
| ACC | 1.1e-03 (5.1e-05) | 1.2e-03 (4.5e-05) | 0.40 (0.02) | 0.39 (0.03) | 8.2e-04 (5.0e-05) | 8.1e-04 (5.0e-05) |
| DLPFC | 1.2e-03 (4.7e-05) | 1.2e-03 (5.5e-05) | 0.37 (0.02) | 0.34 (0.02) | 8.6e-04 (4.5e-05) | 8.6e-04 (5.6e-05) |
| M1 | 1.3e-03 (7.7e-05) | 1.3e-03 (7.4e-05) | 0.42 (0.02) | 0.41 (0.04) | 8.8e-04 (8.5e-05) | 8.8e-04 (8.6e-05) |
| Pre-SMA | 1.2e-0 (5.0e-05) | 1.2e-0 (5.0e-05) | 0.40 (0.02) | 0.39 (0.03) | 8.1e-04 (5.2e-05) | 8.3e-04 (5.2e-05) |
| SMA | 1.3e-03 (6.6e-05) | 1.3e-03 (8.4e-05) | 0.39 (0.03) | 0.38 (0.03) | 9.2e-04 (6.9e-05) | 9.3e-04 (9.0e-05) |
| POp | 1.3e-03 (6.6e-05) | 1.2e-03 (6.1e-05) | 0.36 (0.02) | 0.35 (0.02) | 9.3e-0 (6.3e-05) | 9.4e-04 (5.6e-05) |
Mean and standard deviations (S.D) for DTI metrics including axial diffusivity (AD), fractional anisotropy (FA) and mean diffusivity (MD) collapsed across hemisphere per structure (pars opercularis (POp), anterior cingulate cortex (ACC), dorsolateral prefrontal cortex (DLPFC), primary motor cortex (M1), presupplementary motor area (pre-SMA) and supplementary motor area (SMA)) for healthy controls (HC) and Parkinson’s disease patients (PD). FA values are marked in bold. There is evidence for group differences for the averaged FA values, which are lower in PD than HC.