Impact of contrast enhancement in all segments and regions for all vessels and for only abnormal vessels
| Impact of Contrast Enhancement Grade Change | Frequency | |||||||
|---|---|---|---|---|---|---|---|---|
| BA | ACA | ICA | M1 | M2 | P1/P2 | P3 | Total | |
| All Vessels | ||||||||
| No effect | 40 | 39 | 71 | 71 | 76 | 79 | 79 | 455 |
| Adverse effect but tolerable | 0 | 0 | 5 | 6 | 3 | 1 | 1 | 16 |
| Nondiagnostic | 0 | 1 | 4 | 3 | 1 | 0 | 0 | 9 |
| Total | 40 | 40 | 80 | 80 | 80 | 80 | 80 | 480 |
| Only Abnormal Vessels on Precontrast MR Angiograms | ||||||||
| No effect | 0 | 0 | 4 | 13 | 17 | 2 | 5 | 41 |
| Adverse effect but tolerable | 0 | 1 | 3 | 1 | 3 | 0 | 0 | 8 |
| Nondiagnostic | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 |
| Total | 0 | 1 | 8 | 14 | 20 | 2 | 5 | 50 |