Vasospasm (grades 0–4) of the cerebral arteries (251 segments) as determined with DSA and multidetector row CT angiography in 17 patients
| Arterial Segment (No. of Segment)* | Grade of Vasospasm | No. of Arteries Overestimated by CTA | No. of Arteries Underestimated by CTA | r† | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | 4 | |||||||||
| DSA | CTA | DSA | CTA | DSA | CTA | DSA | CTA | DSA | CTA | ||||
| ICA (34) | 24 | 24 | 6 | 6 | 4 | 4 | 0 | 0 | 0 | 0 | 1.00 | ||
| A1 (32) | 14 | 14 | 1 | 0 | 4 | 5 | 11 | 9 | 2 | 4 | 4 | 1 | 0.9623 |
| A2 (34) | 17 | 17 | 1 | 1 | 1 | 0 | 15 | 14 | 0 | 2 | 3 | 0.9702 | |
| M1 (34) | 22 | 22 | 3 | 2 | 4 | 5 | 5 | 5 | 0 | 0 | 1 | 0.9978 | |
| M2 (34) | 25 | 25 | 1 | 0 | 3 | 3 | 5 | 6 | 0 | 0 | 2 | 0.9958 | |
| P1 (32) | 28 | 28 | 2 | 2 | 1 | 1 | 1 | 1 | 0 | 0 | 1.00 | ||
| P2 (34) | 32 | 32 | 0 | 0 | 1 | 0 | 1 | 2 | 0 | 0 | 1 | 0.9995 | |
| VBA (17) | 15 | 15 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 1.00 | ||
| Total (251) | 177 | 177 | 16 | 13 | 18 | 18 | 38 | 35 | 2 | 6 | 11 | 1 | 0.9966 |
Note.— Data are number of segments. Grade 0 indicates no spasm; grade 1, <25%; grade 2, 25%–50%; grade 3, 51%–99% luminal reduction; grade 4, total occlusion. DSA indicates digital subtraction angiography; CTA, multidetector row CT angiography.
* See Table 2 for definitions of segments.
† r, Spearman correlation coefficient.