Table 2.

Scoring Criteria for Individual Assessments of Overall Image Quality^*

Score	Qualitative SNR	Image Contrast	Synthetic Appearance	Coherent Structural Artifact	Image Blurring
1	Non-diagnostic	Flat (Very little contrast between arterial structures and background)	Severe synthetic appearance	Non-diagnostic	Blurring of all structures
2	Somewhat limiting	Discrete (No gradation)	Moderate synthetic appearance	Significantly limiting artifact	Blurring of most structures
3	Adequate for most structures	Adequate (Gradation can be seen just in low intensity or high intensity objects)	Mild synthetic appearance	Mildly limiting artifact	Blurring of few structures
4	More than adequate for most structures	Outstanding (Gradation can be seen in both low intensity and high intensity objects)	No synthetic appearance	Minimal limiting artifact	No blurring of any structures
5	More than adequate for all structures	-	-	No Artifact	-

^*Images with individual assessment score equal or greater than 3 are considered to be diagnostically acceptable, and less than 3 are considered to be diagnostically non-acceptable.