Impact Studies. Impact studies were completed using the experimental setup illustrated in Figure . A Fastec IL5-S high speed camera was used to record images at 826 fps. A long working distance objective was focused on the brain tissue mimicking soft gel. The light-colored silicones contrasted with the much darker surroundings. An image processing program was developed in Matlab to extract the height of the soft gel over time by thresholding the brightness of each pixel in the image. Pixels with a grayscale brightness of over 40 out of 255 were used to identify the dimensions of the soft gel. The height of the soft gel was averaged over the center 50% of the image to account for any local variation or noise.