splenic index

width=solid arrow thickness=dashed arrow

splenic index=length x width x thickess

length = summing of number of CT slices on which the spleen is visible.
width = is the longest splenic diameter that can be drawn on any transverse image.
thickness = is measured at the level of splenic hilum and is the distance between inner and outer (peripheral) borders of the spleen.
Normal splenic index is from 120 to480 cm3.