Classification of the total blood volume as cisternal, intraventricular, intraparenchymal, and subdural. 1A, Axial slice of a noncontrast CT of a patient with aSAH with concomitant IVH and IPH. 1B, Quantified total blood volume. 1C, Classified cisternal (red), intraventricular (magenta), and intraparenchymal (green) blood. 2A, Axial slice of a noncontrast CT scan of a patient with aSAH with concomitant IVH and SDH. 2B. Quantified total blood volume. 2C, Classified cisternal (red), intraventricular (magenta), and subdural (blue) blood.