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Table 3: Vessel-to-background measurements in 3 arterial and 3 venous vessel segments and decreasing vessel diameters
All Group 1 Group 2 T Test
A1 0.92 ± 0.05 0.88 ± 0.07 0.93 ± 0.04 .0008^a
A2 0.84 ± 0.11 0.77 ± 0.15 0.85 ± 0.10 .0035^a
A3 0.65 ± 0.13 0.56 ± 0.12 0.67 ± 0.13 .0034^a
V1 0.91 ± 0.05 0.86 ± 0.05 0.92 ± 0.04 .0000^a
V2 0.83 ± 0.10 0.76 ± 0.15 0.85 ± 0.08 .0018^a
V3 0.52 ± 0.19 0.34 ± 0.23 0.56 ± 0.15 .0000^a
↵a Significant (P < .05).

	All	Group 1	Group 2	T Test
A1	0.92 ± 0.05	0.88 ± 0.07	0.93 ± 0.04	.0008^a
A2	0.84 ± 0.11	0.77 ± 0.15	0.85 ± 0.10	.0035^a
A3	0.65 ± 0.13	0.56 ± 0.12	0.67 ± 0.13	.0034^a
V1	0.91 ± 0.05	0.86 ± 0.05	0.92 ± 0.04	.0000^a
V2	0.83 ± 0.10	0.76 ± 0.15	0.85 ± 0.08	.0018^a
V3	0.52 ± 0.19	0.34 ± 0.23	0.56 ± 0.15	.0000^a