Figure 1From: Decreased brain venous vasculature visibility on susceptibility-weighted imaging venography in patients with multiple sclerosis is related to chronic cerebrospinal venous insufficiency Three-dimensional scatter plot of the eigenvalues of the Hessian matrix. The voxels belonging to linear structures are those for which |λ2| and |λ3| are negative while |λ1| is close to zero, resulting in the cluster in the bottom part of the plot.Back to article page