Grading summary for all vessels examined
| Grade | Vascular Signal* | Impact of Contrast Enhancement† | ||||
|---|---|---|---|---|---|---|
| Precontrast Images | Postcontrast Images | Postcontrast Images | ||||
| Frequency | Percentage | Frequency | Percentage | Frequency | Percentage | |
| 0 | 430 | 89.6 | 436 | 90.8 | 455 | 94.8 |
| 1 | 23 | 4.8 | 32 | 6.7 | 16 | 3.3 |
| 2 | 26 | 5.4 | 12 | 2.5 | 9 | 1.9 |
| NR | 1 | 0.2 | 0 | 0.0 | — | — |
| Total | 480 | 100 | 480 | 100 | 480 | 100 |
Note.—Data are for median grades across all five observers.
* Vascular signal grade 0 indicates normal segment or region; 1, diminished flow; 2, absent flow; and NR, not readable.
† Impact of contrast enhancement grade 0 indicates no effect; 1, adverse effect but tolerable; 2, nondiagnostic.