Degree of pseudostenosis artifacts
| Contrast Material Concentration & System | Grade for Pseudostenosis Artifact | |
|---|---|---|
| Right M1 | Left M1 | |
| 300 mg I/mL | ||
| FPD | 1 | 1 |
| I.I. | 3 | 3 |
| 150 mg I/mL | ||
| FPD | 0 | 1 |
| I.I. | 2 | 2 |
Note:—FPD indicates flat panel detector; I.I., image intensifier; M1, sphenoidal segment of middle cerebral artery. Grades: 0, no stenosis; 1, mild stenosis less than 30%; 2, moderate stenosis of 30%–69%; 3, severe stenosis more than 70%.