Fig 4.

Three-directional linear indicators for evaluating the size of bilateral ventricles. The figures are the 3-directional MPR reconstruction images of the T2-weighted 3D SPACE. On the basis of the anterior/posterior commissure line, x-, y-, and z-axes for spatial coordinates of head position were defined. The green lines show the maximum length of 3-axial directions of the bilateral ventricles. The yellow lines show the maximum 3-axial length of the frontal horn of the bilateral ventricles. The red lines show the maximum intracranial 3-axial width. In addition to the original Evans Index, the y- and z-Evans Indices were defined as the maximum length from the foramen of Monro to the anterior and superior extremities of the frontal horns (yellow lines)/the maximum intracranial y- and z-axial length (red lines), respectively. The x-, y-, and z-Maximum Indices were defined as the maximum width of the bilateral ventricles (green lines)/the maximum intracranial width on the each of the 3 dimensions (red lines).