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Table 2: Results of the evaluation of the diameters of the main vessels^{^a}
Anatomic Structure Mean Rater 1 (A.U.) Mean Rater 2 (A.U.) No. Pearson Correlation Coefficient R Significance
Basal vein (R) 1.7 ± 0.4 1.6 ± 0.8 24 0.563 .003
Basal vein (L) 1.8 ± 0.4 1.7 ± 0.4 25 0.659 <.001
Lateral mesencephalic vein (R) 0.9 ± 0.5 0.9 ± 0.5 19 0.753 <.001
Lateral mesencephalic vein (L) 0.7 ± 0.7 0.8 ± 0.6 20 0.828 <.001
Anterior pontomesencephalic vein 0.6 ± 0.6 0.6 ± 0.5 25 0.726 <.001
SPS (R) 2.6 ± 0.5 2.5 ± 0.7 25 0.663 <.001
SPS (L) 2.6 ± 0.6 2.5 ± 0.6 25 0.595 .002
Note:—No. indicates the number of veins present; R, right; L, left; A.U., arbitrary units.
↵a Missing veins were omitted for the calculation of the mean and rated as 0 mm for the correlation coefficient. Visible veins <0.5 mm were rated as 0.2 mm.

Anatomic Structure	Mean Rater 1 (A.U.)	Mean Rater 2 (A.U.)	No.	Pearson Correlation Coefficient R	Significance
Basal vein (R)	1.7 ± 0.4	1.6 ± 0.8	24	0.563	.003
Basal vein (L)	1.8 ± 0.4	1.7 ± 0.4	25	0.659	<.001
Lateral mesencephalic vein (R)	0.9 ± 0.5	0.9 ± 0.5	19	0.753	<.001
Lateral mesencephalic vein (L)	0.7 ± 0.7	0.8 ± 0.6	20	0.828	<.001
Anterior pontomesencephalic vein	0.6 ± 0.6	0.6 ± 0.5	25	0.726	<.001
SPS (R)	2.6 ± 0.5	2.5 ± 0.7	25	0.663	<.001
SPS (L)	2.6 ± 0.6	2.5 ± 0.6	25	0.595	.002