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Measurement of brain atrophy. (A) Measurement of CCA (green line) and median sagittal area (red dot line); (B) CCI = (aa' + bb' + cc')/ab; (C) U3VW (green line) and a3VW (red line) are measured on the horizontal plane; (D) the third ventricle width (d) is measured at the midpoint of its length. CCA, corpus callosum area; CCI, corpus callosum index; U3VW, unaligned third ventricle width.
