Interobserver variability in measurement of degree of carotid stenosis on digital subtraction intra-arterial angiography, CT angiography, and MR angiography in symptomatic arteries
| Digital subtraction intra-arterial angiography | ||||
|---|---|---|---|---|
| Observer 1 | ||||
| Operable | Not operable | κ Value | ||
| Observer 2: | Operable | 13 | 0 | |
| Not operable | 7 | 14 | 0.60 | |
| MR angiography | ||||
|---|---|---|---|---|
| Observer 3 | ||||
| Operable | Not operable | κ Value | ||
| Observer 4: | Operable | 20 | 3 | |
| Not operable | 4 | 7 | 0.52 | |
| Spiral CT angiography | ||||
|---|---|---|---|---|
| Observer 5 | ||||
| Operable | Not operable | κ Value | ||
| CT, computed tomography; MR, magnetic resonance. | ||||
| Observer 6: | Operable | 13 | 2 | |
| Not operable | 7 | 12 | 0.48 | |