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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.