TABLE 3:

Summary of quality scores for images produced with CTA and DSCTA

Test	Operator 1 (n = 30)			Operator 2 (n = 30)
	Mean	Median	SD	Mean	Median	SD
CTA	2.50	3	0.86	2.67	3	0.80
Hard-copy check by operator 3	3.07	3	1.17	2.83	3	1.09
DSCTA	3.37	3	0.81	3.30	3	0.95
Hard copy check by operator 3	3.97	4	0.85	3.83	4	0.95
DSCTA minus CTA*	0.87	1	0.73	0.63	1	0.56
Hard-copy check by Observer 3†	0.90	1	1.03	1.00	1	1.11

^*95% CIs were 0.59, 1.14 for operator 1 and 0.43, 0.84 for operator 2. P values with the t test were <.001 for both operators.

^†95% CIs were 0.52, 1.25 for operator 1 and 0.58, 1.42 for operator 2. P values with the t test were <.001 for both operators.