Table 1.

A vascular opacification score was created from the opacification variables as shown in the following table

Main/Lobar	Segmental	Subsegmental	Score
Good	Good	Good	0
Good	Good	Fair	1
Good	Fair	Fair	2
Good	Good	Poor	2
Fair	Fair	Fair	3
Good	Fair	Poor	3
Fair	Fair	Poor	4
Fair	Poor	Poor	5
Good	Poor	Poor	5
Poor	Poor	Poor	6
Poor	Fair	Poor	6