Table 3:

Distribution of venous contamination at CE-MRA and TR-MRA in the 3 groups^{^a}

Arterial Segment	Group A				Group B				Group C
Arterial Segment	Grade 0	Grade 1	Grade 2	Grade 3	Grade 0	Grade 1	Grade 2	Grade 3	Grade 0	Grade 1	Grade 2	Grade 3
Right brachiocephalic trunk	138/137	1/1	0/1	0/0	164/165	4/4	1/0	0/0	154/154	0/0	0/0	0/0
Right subclavian artery	61/118	77/19	1/2	0/0	64/123	104/40	1/6	0/0	59/115	93/35	2/4	0/0
Left subclavian artery	128/136	11/0	0/3	0/0	164/168	5/1	0/0	0/0	142/147	10/6	2/1	0/0
Right CCA	110/134	29/4	0/1	0/0	146/156	23/12	0/1	0/0	112/139	41/14	1/1	0/0
Right extracranial ICA	25/101	114/38	0/0	0/0	21/119	148/50	0/0	0/0	5/111	148/43	1/0	0/0
Right intracranial ICA	24/108	109/31	6/0	0/0	24/120	138/49	6/0	1/0	30/114	120/39	4/1	0/0
Left CCA	125/133	14/5	0/1	0/0	158/167	11/2	0/0	0/0	140/148	13/5	1/1	0/0
Left extracranial ICA	28/103	111/36	0/0	0/0	24/111	145/58	0/0	0/0	15/109	137/45	2/0	0/0
Left intracranial ICA	25/97	102/40	12/2	0/0	19/115	142/53	8/1	0/0	32/112	115/42	7/0	0/0
Right vertebral artery orifice	122/137	17/1	0/1	0/0	151/160	17/6	1/3	0/0	132/145	22/7	0/2	0/0
Right vertebral artery	54/112	84/27	1/0	0/0	68/139	101/29	0/1	0/0	45/126	104/27	5/1	0/0
Left vertebral artery orifice	132/139	7/0	0/0	0/0	166/167	3/1	0/1	0/0	143/151	10/3	0/0	1/0
Left vertebral artery	51/115	86/24	2/0	0/0	63/145	105/24	1/0	0/0	51/131	101/22	2/1	0/0
Basilar artery	29/119	103/16	6/4	1/0	51/142	105/25	13/2	0/0	36/134	111/20	7/0	0/0