Table 2. Mean number and range of perforating branches per parent artery identified in the 7T postcontrast TOF-MRA images.

Parent artery	Mean (number of perforators/ number of patients	Range
Anterior communicating artery	0.4 (4/10)	0–1
Anterior cerebral artery	2.5 (25/10)	1–4
Middle cerebral artery	3.5 (35/10)	1–8
Anterior choroidal artery	2.2 (22/10)	0–4
Posterior communicating artery a	1.6 (14/9)	1–3
Posterior cerebral artery	5.1 (51/10)	2–7
Basilar artery b	5.0 (35/7)	1–9
Vertebral artery b	2.0 (4/2)	2

^aIn one patient the posterior communicating artery was absent bilaterally.

^bOnly scans containing this segment within the FOV were taken into account.