FIG 1. A, Normal midsagittal spin-echo T1-weighted MR image of the brain (400/12 [TR/TE]).

B, Schematic representation of the parameters, which are defined in the text.

A, chiasmal line; B, third ventricular line; C, callosal line; D, callosal height; E, anterior callosal height; F, mammillocommissural distance; G, mammillopontine distance; H, third ventricular splenial distance; I, spleniochiasmal distance.