Table 1. Overview of the number of perforating arteries branching off from the circle of Willis and proximal intracranial arteries identified in the individual postcontrast TOF-MRA scans (1–10).
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Parent artery | Target / direction (name) | # L | # R | # L | # R | # L | # R | # L | # R | # L | # R | # L | # R | # L | # R | # L | # R | # L | # R | # L | # R |
| ACoA | unknown | 1 | 1 | 1 | 1 | ||||||||||||||||
| ACA | medial lenticulostriate arteries | 1 (A1/A2) | 1 (A1) | 1 (A1) | 1 (A2) | 1 (A1) | 1 (A2) | 1 (A2) | 1 (A1/A2) | 2 (A1) | 1 (A1) | 1 (A1/A2) | 2 (A1) | 2 (A2) | 1 (A1) | 1 (A1) | 2 (A1 + prox A2) | 1 (A1) | |||
| unknown | 1 (A2) | 2 (A1) | 1 (A1) | ||||||||||||||||||
| MCA | lateral lenticulostriate arteries | 1 (M1) | 1 (M2) | 1 (M1) | M1 L absent | 1 (M1) | 3 (M1) | 2 (M1) | 2 (M1) | 1 (M1) | 2 (M1) | 2 (M1) | 3 (M1) | 2 (M1) | 1 (M1) | 2 (M1) | 3 (M1) | 2 (M1) | 2 (M1) | 1 (M1) | |
| unknown | 1 (M1) | 2 (M1) | |||||||||||||||||||
| AChA | internal capsule | 1 | |||||||||||||||||||
| unknown | 1 | 1 | 1 | 3 | 2 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 1 | |||||||
| PCoA | various (hypothalamus / optic tract / thalamus) | 1 | PCoA R absent | PCoA L absent | 1 | 1 | 1 | PCoA L absent | PCoA R absent | 1 | 1 | ||||||||||
| unknown | 1 | 1 | 1 | 1 | 2 | 1 | 1 | ||||||||||||||
| PCA | interpeduncular cistern / peduncle | 1 (P1) | 1 (P1) | 1 (P1) | 2 (P1) | 3 (P1) | 1 (P1) | 2 (P1) | 2 (P1) | 1 (P1) | 1 (P1) | 2 (P1) | |||||||||
| midbrain (circumflex arteries) | 2 (P2 +P1) | 1 (P2) | 2 (P1+P2) | 1 (P1) | 1 (P1) | 1 (P1) | 1 (P1) | 2 (P1) | 1 (P1) | 2 (P1) | 2 (P1) | 2 (P1 + P2) | 1 (P1) | 1 (P1) | 1 (P1) | 1 (P1) | 2 (P1 + P1/P2) | 1 (P1) | 2 (P1) | ||
| both thalami (Percheron) | 1 (P1) | 1 (P1) | |||||||||||||||||||
| thalamus | 1 (P1) | 1 (P1 + BA/P1) | 1 (P1) | ||||||||||||||||||
| lentiform nucleus | 1 (P1) | ||||||||||||||||||||
| unknown | 1 (P1) | ||||||||||||||||||||
| BA | pontine | 8 | (*) | (*) | 4 (*) | 4 | 2 | 1 | 7 | 8 (7x BA, 1x SCA L) | (*) | ||||||||||
| midbrain | 1 (SCA R) | ||||||||||||||||||||
| VA | feeder of anterior spinal artery | 1 | 1 | (**) | (**) | (**) | (**) | (**) | (***) | 2 | (**) | (**) | |||||||||
(*) only distal segment BA in FOV;
(**) VA not in FOV;
(***) only distal segment VA L in FOV.
A2, M2 and P2:only proximal segment taken into account. L = left; R = right. A1, M1, P1 = first segment of the anterior, middle and posterior cerebral artery; A2, M2, P2 = second segment of the anterior, middle, and posterior cerebral artery; ACoA = anterior communicating artery; ACA = anterior cerebral artery; AChA = anterior choroidal artery; BA = basilar artery; MCA = middle cerebral artery; PCA = posterior cerebral artery; PCoA = posterior communicating artery; SCA = superior cerebellar artery; VA = vertebral artery.