Qualitative image analysisa
| Non-SEMAR | SEMAR | P Value | κ Value | ||
|---|---|---|---|---|---|
| Non-SEMAR | SEMAR | ||||
| The severity of metallic artifacts | 1.2 ± 0.4 | 2.9 ± 0.2 | <.01 | 0.53 (5) | 0.65 (1) |
| Visibility of structures | |||||
| Electrode localization | 1.5 ± 0.6 | 3.5 ± 0.5 | <.01 | 0.62 (8) | 0.53 (8) |
| Basal ganglia | 1.2 ± 0.4 | 3.0 ± 0.4 | <.01 | 0.57 (5) | 0.61 (5) |
| Thalamus | 1.1 ± 0.3 | 2.8 ± 0.5 | <.01 | 0.63 (2) | 0.66 (5) |
| Cortico-medullary junction | 1.8 ± 0.3 | 3.4 ± 0.5 | <.01 | 0.51 (7) | 0.72 (5) |
| Sylvian fissure | 2.1 ± 0.7 | 3.7 ± 0.5 | <.01 | 0.58 (8) | 0.58 (6) |
| Lateral ventricle | 2.0 ± 0.5 | 3.8 ± 0.4 | <.01 | 0.70 (4) | 0.53 (9) |
| Third ventricle | 1.6 ± 0.5 | 3.2 ± 0.7 | <.01 | 0.56 (7) | 0.58 (6) |
| Background image quality | |||||
| GM-WM contrast | 3.2 ± 0.6 | 3.3 ± 0.6 | .11 | 0.60 (8) | 0.68 (7) |
| Image noise | 3.2 ± 0.4 | 3.2 ± 0.4 | .32 | 0.61 (4) | 0.53 (4) |
| Overall diagnostic confidence | 1.4 ± 0.5 | 3.1 ± 0.4 | <.01 | 0.52 (8) | 0.56 (4) |
↵a Data are means. Parentheses show the number of cases for which the subjective score before consensus reading was disputed by both readers. Scale for subjective score: 1 = undiagnostic, 2 = suboptimal, 3 = acceptable, 4 = fully diagnostic.