Table 2.
T2-FLAIR MRI characteristics of the datasets used for analyses.
| Number of scanners | Training/validation/testing MS dataset (n = 4,590) |
Scan rescan dataset (n = 5) |
Inter-scanner dataset (n = 177) |
Clinical MS dataset (n = 49) |
||
|---|---|---|---|---|---|---|
| 2D FLAIR (n = 4288) |
3D FLAIR (n = 302) |
|||||
| 54 | 5 | 1 | 2 | 1 | ||
| TR, mean (SD) ms | 8631.5 (2336.3) | 4825.0 (1733.6) | 8500.0 (0.0) | 8002.0 (0.0) | 8500.0 (0.0) | 11000.0(0.0) |
| TE, mean (SD) ms | 124.9 (68.5) | 368.2 (93.5) | 122.0 (0.15) | 61.0 (0.12) | 122.0 (0.15) | 140.0 (0.0) |
| TI, mean (SD), ms | 2167.9 (432.6) | 1682.3 (337.8) | 2100.0 (0) | 2000.0 (0) | 2100.0 (0) | 2600.0 (0.0) |
| Slice thickness mean (SD), [min max], mm | 3.3 (1.12) [1.0 6.0] | 1.28 (0.8) [1.0 2.0] | 3.0 (0.0) [3.0 3.0] | 3.0 (0.0) [3.0 3.0] | 3.0 (0.0) [3.0 3.0] | 3.0 (0.0) [3.0 3.0] |
| Axial n (%) / Sagittal n (%) | 89 (82%) / 20 (18%) | 236 (78%) / 66 (22%) | 12 (100%) / 0 (0%) | 201 (100%) / 0 (0%) | 201 (100%) / 0 (0%) | 1725 (100%) / 0 (0%) |
Legend: MS – multiple sclerosis; SD – standard deviation; TR-repetition time; TE-echo time; TI-inversion time; mm-millimeters; ms-milliseconds.