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Table 1: Distribution of collaterals grades by rVE-ASL and DSA
rVE-ASL collateral grade DSA collateral grade 
0 1 2 3 Total
0 0 0 0 0 0
1 0 12 2 0 14
2 0 1 4 0 5
3 0 0 0 21 21
Total 0 13 6 21 40
Note:— 0: poor, no visible collaterals; 1: intermediate, partial collateral flow to the side of stenosis/occlusion; 2: good, full collateral flow to the side of stenosis/occlusion; 3: normal antegrade flow.
rVE-ASL collateral grade
rVE-ASL collateral grade	1	2	3	Total
0	0	0	0	0
1	12	2	0	14
2	1	4	0	5
3	0	0	21	21
Total	13	6	21	40