Table 2:

Imaging parameters and collateral measures (visual and automated TOF- and CE-MRA)

Imaging Parameters^{^a}	All Patients	Final Infarct <90 mL	Final Infarct >90 mL	P	Penumbra Saved >50%	Penumbra Saved <50%	P
Tissue imaging measurements
Admit DWI infarct volume (mL) (mean ± SD)	30.8 (41.0)	16.3 (18.9)	59.0 (56.2)	.01^{^b}	22.6 (27.0)	55.5 (63.3)	.12
Final DWI infarct volume (mL) (mean ± SD)	89.4 (114.9)	25.3 (26.3)	213.4 (119.1)	<.01^{^b}	42.5 (47.8)	230.2 (142.8)	.01^{^b}
Penumbra saved (%) (mean ± SD)	68.5 (39.2)	88.4 (22.2)	30.0 (36.5)	<.01^{^b}	89.5 (14.2)	5.7 (12.9)	<.01^{^b}
Admit Tmax volume (mL) (mean ± SD)	182.0 (97.0)	158.3 (70.5)	227.8 (124.7)	.06	189.5 (81.0)	159.5 (136.9)	.50
Successful recanalization (No.) (%)	32 (73)	25 (86)	7 (47)	.01^{^b}	27 (82)	5 (45)	.05^{^b}
Visual collateral score (range, 0–2)
TOF-CS (mean ± SD)	.1 (.3)	.1 (.4)	.0 (.0)	.30	.0 (.2)	.2 (.6)	.39
CE-CS (mean ± SD)	1.0 (.8)	1.3 (.7)	.4 (.6)	<.01^{^b}	1.1 (.8)	.6 (.8)	.01^{^b}
Atlas-based collateral index (range, 0–1)
TOF-CI (mean ± SD)	.39 (.09)	.42 (.07)	.35 (.09)	.01^{^b}	.42 (.07)	.32 (.07)	<.01^{^b}
CE-CI (mean ± SD)	.70 (.21)	.81 (.10)	.49 (.20)	<.01^{^b}	.77 (.12)	.49 (.26)	.01^{^b}

↵a Continuous and discrete imaging parameters compared with the unpaired t test and Mann-Whitney U rank sum test, respectively.
↵b Significant.