Vessel diameters by age group (mm)
| 0–6 months | 1 year | 2 years | 3 years | 4 years | 5–9 years | 10–14 years | 15–18 years | |
|---|---|---|---|---|---|---|---|---|
| N=2 | N=1 | N=3 | N=1 | N=4 | N=16 | N=17 | N=10 | |
| CCA below bulb | 5.6±0.4 | – | 6.3±1.1 | 5.5 | 7.8±0.2 | 9.2±1.4 | 9.6±1.1 | 10.3±1.7 |
| ICA above bulb | 4.8±1.2 | – | 5.4±0.4 | 5.3 | 7.0±0.3 | 7.9±1.3 | 8.0±0.8 | 8.6±1.0 |
| High cervical ICA | 3.9±0.7 | 5.1±0.6 | 5.5±1.0 | 4.1 | 6.7±0.7 | 7.0±1.0 | 7.3±0.7 | 7.7±0.8 |
| Petrous ICA | 3.7±0.7 | 4.4±0.1 | 4.6±0.5 | 5.2±0.2 | 5.9±1.1 | 5.8±1.0 | 6.3±0.8 | 6.9±0.7 |
| ICA terminus | 3.1±0.6 | 3.5±0.8 | 4.1±0.4 | 4.3±0.6 | 4.8±0.6 | 4.4±0.7 | 4.7±0.6 | 4.8±0.5 |
| M1 | 2.6±0.4 | 2.7±0.5 | 3.9±0.5 | 3.6±0.3 | 3.9±0.5 | 3.6±0.5 | 3.8±0.4 | 4.0±0.5 |
| High cervical VA | – | 2.6 | – | – | 5.8 | 5.5±0.9 | 6.0±0.7 | 4.4±1.2 |
| Intracranial VA | – | 2.5 | 4.1 | 3.4 | 3.9±0.1 | 4.3±0.7 | 4.2±0.6 | 4.5±1.2 |
| P1 | – | 1.3±0.1 | 2.6 | 2.8 | 2.7±0.3 | 2.8±0.6 | 2.9±0.4 | 2.8±0.7 |
| Basilar | – | 2.0 | 4.3 | 3.8 | 4.5±0.2 | 4.2±0.8 | 4.1±0.4 | 4.3±0.8 |
CCA, common carotid artery; ICA, internal carotid artery; VA, vertebral artery.