Table 1.

Subjective image quality assessment.

Evaluation items	5 points	4 points	3 points	2 points	1 point
Arterial margin	Smooth	Mild rough	Moderate Rough	Rough	Extensive Rough
Depiction of small arterial details	Best	Better	General	Bad	Worse
Venous contamination	Least	Less	General	Much	More
Side-branches	Clear	Moderate clear	Mild clear	Rough	Unclear
Perforators	Clear visibility	Moderate visibility	Mild visibility	Hardly visible	Invisible
The whole image quality	Best	Better	General	Bad	Worse
Diagnostic confidence	Sufficient	Less sufficient	General	Insufficient	Unable to diagnose