Table 3

‚ÄÉMagnitude of improvement in quantitative image quality assessment (SD)

Angiogram typeEarly phaseMid-phaseLate phase
Scale: The improvement is given in arbitrary units. Adobe Photoshop version 5.5 (Macintosh) was used to add Gaussian noise. The variable amount of noise that can be added ranges from 0 to 999 units.
IV FA15 (8.9)17.5 (13.4)21.5 (13.4)
ICGA15.3 (4.5)15.5 (6.4)18.8 (10.3)
Oral FA19.8 (9)16.1 (7.8)22.7 (6)