Percentage of nonvisualized collaterals in 3D time-of-flight MR angiography studies
| Study* | No. of Subjects | Age, y | AcoA, % | A1, % | PcoA, % | P1, % |
|---|---|---|---|---|---|---|
| Healthy volunteers | ||||||
| Krabbe-Hartkamp et al (3) | 150 | 55 | 19 | 3 | 28 | 2 |
| Current study† | 50 | 51 | 10 | 1 | 22 | 7 |
| Cerebrovascular patients | ||||||
| Patrux et al (4) | 54 | 44 | 54 | 5 | 56 | 8 |
| Stock et al (5) | 62 | 52 | 40 | 4 | 39 | 4 |
| Hartkamp et al (23) | 75 | 62 | 7 | 3 | 21 | 2 |
| Brunereau et al (24) | 109 | 21–82 | 45 | 2 | 44 | 12 |
* Numbers in parentheses are reference citations.
† Data were derived from the consensus review.