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Table 2: Qualitative analysis of image quality: BPA versus SCA
BPA^a SCA^a P Value
Arterial segment 
    ICA (sub) 2.74 ± 0.56 2.42 ± 0.76 .019
    ICA (unsub) 2.88 ± 0.33 2.56 ± 0.61 .002
    M1 (sub) 2.60 ± 0.67 2.50 ± 0.58 .427
    M1 (unsub) 2.80 ± 0.45 2.62 ± 0.49 .059
    M2 (sub) 2.38 ± 0.75 2.00 ± 0.78 .015
    M2 (unsub) 2.62 ± 0.57 2.24 ± 0.69 .003
    M3 (sub) 2.18 ± 0.77 1.56 ± 0.93 <.001
    M3 (unsub) 2.44 ± 0.58 1.76 ± 0.92 <.001
Venous segment 
    Superficial (sub) 2.94 ± 0.24 2.96 ± 0.20 .650
    Superficial (unsub) 2.98 ± 0.14 2.96 ± 0.2 .562
Artifactual degradation 
    Deep (sub) 2.80 ± 0.4 2.60 ± 0.53 .037
    Deep (unsub) 2.92 ± 0.27 2.74 ± 0.44 .016
    Subtracted 2.78 ± 0.55 2.74 ± 0.53 .781
    Unsubtracted 2.82 ± 0.44 2.74 ± 0.53 .473
Subtraction^b 
    Subtraction 0.98 ± 0.14 0.92 ± 0.27 .172
Note:—All values are reported as mean ± standard deviation; 0 indicates nondiagnostic; 1, diagnosis possible but limited; 2, good; 3, excellent; sub, unsub, subtracted and nonsubtracted.
↵a Qualitative designation of diagnostic quality derived from 4-point scale (see text).
↵b Indicates percentage of cases for which background subtraction was satisfactory.