Table 1:

Estimates of vessel sharpness (1 mm) defined as the reciprocal sum of the width from 25% to 75% of the maximum intensity increase in 3 arterial and 3 venous vessel segments and decreasing vessel diameters

	All	Group 1	Group 2	T Test
A1	0.39 ± 0.04	0.37 ± 0.03	0.40 ± 0.04	.0010^a
A2	0.41 ± 0.08	0.41 ± 0.10	0.41 ± 0.07	.4896
A3	0.47 ± 0.10	0.47 ± 0.12	0.47 ± 0.09	.4928
V1	0.30 ± 0.05	0.28 ± 0.04	0.30 ± 0.05	.0648
V2	0.35 ± 0.06	0.37 ± 0.08	0.34 ± 0.06	.0543
V3	0.52 ± 0.15	0.62 ± 0.24	0.49 ± 0.11	.0016^a

Note:—A1 indicates internal cerebral artery (lacerum segment, large artery); A2, middle cerebral artery (proximal segment “M1,” medium-sized artery); A3, anterior cerebral artery (small artery); V1, superior sagittal sinus (1 cm proximal of the confluens, large vein); V2, straight sinus (1 cm proximal of the confluens, medium-sized vein); V3, inferior sagittal sinus (1 cm proximal to the straight sinus, small vein).
↵a Significant (P < .05).