BACKGROUND: A precise definition of ventricular enlargement is important in the diagnosis
of hydrocephalus as well as in assessing central atrophy. The Evans index (EI), a linear ratio
between the maximal frontal horn width and the cranium diameter, has been extensively
used as an indirect marker of ventricular volume (VV). With modern imaging techniques,
brain volume can be directly measured. OBJECTIVE: To determine reference values of
intracranial volumes in healthy elderly individuals and to correlate volumes with the EI …