Table 3.
Striatal DAT availabilities, declines per decade of DAT availabilities, and striatum sizes in the transverse slices of the striatum ROIs defined by the atlas approaches.
| Transverse slices∗∗ | MRI-normalization | SPECT-normalization | ||||
|---|---|---|---|---|---|---|
| Average∗∗∗ | Decline per decade | Average size∗ | Average∗∗∗ | Decline per decade | Average size∗ | |
| ≤(OMz) − 2 | 1.46 | 5.12% | 68.4 | 1.54 | 4.15% | 78.3 |
| (OMz) − 1 | 1.78 | 6.19% | 57.7 | 1.86 | 5.74% | 67.4 |
| (OMz) | 1.76 | 7.67% | 76.4 | 1.81 | 7.17% | 87.2 |
| (OMz) + 1 | 1.64 | 8.30% | 89.8 | 1.66 | 8.04% | 97.1 |
| (OMz) + 2 | 1.44 | 9.41% | 92.7 | 1.47 | 8.89% | 94.3 |
| (OMz) + 3 | 1.21 | 10.34% | 87.5 | 1.25 | 10.29% | 80.7 |
| (OMz) + 4 | 0.99 | 11.56% | 73.8 | 1.04 | 11.51% | 60.8 |
| (OMz) + 5 | 0.79 | 11.84% | 56.9 | 0.85 | 12.70% | 41.2 |
| ≥(OMz) + 6 | 0.58 | 14.42% | 77.4 | 0.68 | 11.91% | 30.4 |
*Voxels: each voxel is of 2.897 mm × 2.897 mm × 2.897 mm.
**OMz: the z axis of the OC mark is at the transverse slice with the largest striatum area.
***For comparisons, the same OC averages from the threshold-ROI methods were used in the calculation of (ST-OC)/OC.