Table 3.
Total numbers and types of MRI reviewed.
| MR Imaging | NMOSD | MS | Total | p-value |
|---|---|---|---|---|
| Cases–N | 66 | 100 | 166 | |
| MRI Brain (scans)– N | 139 | 298 | 437 | |
| Scans per case–median (range) | 1 (0–10) | 2 (1–10) | ||
| Magnet– n (%) | ||||
| 0.5/1T | 1 (1) | 1 (0) | ||
| 1.5T | 100 (72) | 207 (70) | 309 (71) | ns |
| 3T | 37 (27) | 90 (30) | 127 (29) | |
| Axial slice thickness– n (%) | ||||
| <5 mm | 53 (38) | 121 (41) | 174 (40) | ns |
| 5 mm or greater | 86 (62) | 177 (59) | 263 (60) | |
| Axial sequence– n (%) | ||||
| FLAIR | 124 (89) | 265 (90) | 389 (89) | ns |
| T2 | 15 (11) | 33 (10) | 48 (11) | |
| Gd given– n (%) | ||||
| Yes | 89 (64) | 172 (58) | 261 (60) | ns |
| No | 50 (36) | 126 (42) | 176 (40) | |
| Timing– n (%) | ||||
| During relapse | 70 (50) | 40 (13) | 110 (25) | <0.0001 |
| In remission | 69 (50) | 258 (87) | 327 (75) | |
| Orbital Imaging–n (%) | 43 (31) | 12 (4) | 27 (6) | <0.0001 |
| MRI Spine (scans)-N | 134 | 166 | 300 | |
| Scans per case–median (range) | 1.5 (0–8) | 1 (0–8) | ||
| Magnet– n (%) | ||||
| 1.5T | 95 (71) | 135 (81) | 230 (77) | 0.034 |
| 3T | 39 (29) | 31 (19) | 70 (23) | |
| Sagittal slice thickness– n (%) | ||||
| <4 mm | 79 (59) | 115 (69) | 194 (65) | ns |
| 4 mm or greater | 55 (41) | 51 (31) | 106 (35) | |
| Gd given– n (%) | ||||
| Yes | 83 (62) | 78 (47) | 161 (540) | 0.01 |
| No | 51 (38) | 88 (53) | 139 (46) | |
| Timing– n (%) | ||||
| During relapse | 66 (49) | 27 (16) | 93 (31) | <0.0001 |
| In remission | 68 (51) | 139 (84) | 207 (69) | |
| Total Scans | 273 | 464 | 737 | |
MRI, magnetic resonance imaging; NMOSD, neuromyelitis optica spectrum disorders; MS, multiple sclerosis; T, Tesla; FLAIR, T2 weighted Fluid Attenuated Inversion Recovery; T2, T2 weighted image; Gd, gadolinium.