Fig. 3.

Using digital photographs, regional intracranial hemorrhage was quantified in each animal following a rapid head rotation. Using anatomical markers to divide the brain into 5 regions (anterior left, anterior right, posterior left, posterior right, and midline), the percent of brain surface covered by hemorrhage in each region was calculated by counting the number of pixels containing blood and dividing by the total number of pixels in that region. Hatched regions in the images indicate parts of the brain surface not quantified in that image view. This prevented double counting pixels present in multiple views.