Table 1.

Scoring guidelines used by two blinded readers.

Category	Description	Score
Background	Substantial background that interferes with diagnostic interpretation.	0
	Moderate background signal, does not interfere with interpretation.	1
	No Substantial Noise (i.e. very good background subtraction)	2
Blurring/Edge Sharpness	Severe Blurring. Vessel dropouts. Non-diagnostic.	0
	Moderate to Severe blurring. Loss of Diagnostic Accuracy.	1
	Moderate blurring. Does not interfere with diagnostic interpretation.	2
	Minimal blurring.	3
	No evident blurring.	4
Vessel Visualization	Non-Diagnostic or Not Visible	0
	Poor (Structures visible but with significant blurring or artifacts, barely diagnostic)	1
	Fair (Anatomy visible, moderate blurring or artifacts, partially diagnostic)	2
	Good (Good quality diagnostic information, minimal blurring or artifacts)	3
	Excellent (Excellent quality diagnostic information, sharply defined borders)	4