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Table 2: Subjective evaluation for the 2D DSA regarding the depiction of simulated aneurysms
Contrast Material Concentration & Dose Mode Score for Image Quality P
5 4 3 2 1 Mean ± SD* 
300 mgI/mL 
    Standard-dose mode of FPD system 57 0 0 0 0 5.00 ± 0.00^** .038
    Low-dose mode of FPD system 57 0 0 0 0 5.00 ± 0.00^** .038
    Conventional-dose mode of I.I.-TV system 52 3 2 0 0 4.88 ± 0.43 
150 mgI/mL 
    Standard-dose mode of FPD system 55 1 1 0 0 4.95 ± 0.29^** <.001
    Low-dose mode of FPD system 52 4 1 0 0 4.90 ± 0.36^** <.001
    Conventional-dose mode of I.I.-TV system 41 10 5 1 0 4.60 ± 0.73 
100 mgI/mL 
    Standard-dose mode of FPD system 41 12 4 0 0 4.65 ± 0.61^** <.001
    Low-dose mode of FPD system 39 13 5 0 0 4.60 ± 0.65^** <.001
    Conventional-dose mode of I.I.-TV system 1 15 26 13 2 3.00 ± 0.85 
Note:—DSA indicates digital subtraction angiography; FPD, flat panel detector; I.I.-TV, image intensifier television. Data are mean ± SD of scores for image quality evaluated using a 5-point scale (1, clearly visualized; 2, good; 3, reasonably good; 4, poor; 5, very poor)
** Significantly higher to I.I.-TV system (the Wilcoxon signed rank test).