Table 1.

Indexes determined on the basis of linear measurements of the central nervous system

Evans index	Greatest dimension between anterior horns of lateral ventricles/maximal internal cranial diameter
Bicaudate index	Shortest dimension between the heads of caudate nuclei/internal transverse diameter at the level of caudate nucleus head
Bicaudal index	Shortest dimension between the heads of caudate nuclei/maximum internal transverse cranial diameter
Bicaudal-frontal index	Shortest dimension between the heads of caudate nuclei/maximum distance between anterior horns
Anterior horn width index	The sum of anterior horn width/maximum internal cranial diameter
Occipital horn distance index	Maximum spacing of occipital horns/maximum internal cranial transverse diameter
Occipital horn-to-cranium distance index	Mean distance from occipital horns to internal surface of the cranium at the same level/maximum cranial diameter
Occipital horn width ratio	Mean width of occipital horns/maximum internal cranial diameter
Schiersmann index	Maximum external cranial diameter at the level of cella media/cella media width
Huckmann number	Anterior horn width + smallest width of lateral ventricles