Fig 1.

Tractography of the fornix by using tract-specific analysis. A, The maximal anteroposterior length of the inner skull on the parallel line with the anterior/posterior commissure line is measured on the midline sagittal plane by using 3D T1-weighted images. B and C, Diffusion tensor tractography of the fornix is generated by using the seed region of interest (B) on the convergence of the 2 columns in the body of the fornix and the target regions of interest (C) on the right or the left crus of the fornix in front of the corpus callosum. D, An example of the drawn tractography of the fornix of a healthy subject.