Figure 9 : Gyrificaiton index to quantify cortical folding.

From: A mechanical model predicts morphological abnormalities in the developing human brain

Figure 9

The gyrification index is the ratio between the complete cortical contour length, solid line, and the outer cortical contour length, dashed line. It is used to quantify the degree of cortical folding and can be determined semi-automatically by contour tracing.