Diagnostic agreement of the number of afferent veins on MDCT and DSA The number of afferent veins MDCT DSA k 1 afferent vein 31 24 k = 0.67 2 afferent veins 13 17 3 afferent veins 4 7 Total 48 48 Comment: The diagnostic agreement of the number of afferent veins on MDCT and DSA was substantial with k = 0.67.