Figure 3 From: Real-time phase-contrast x-ray imaging: a new technique for the study of animal form and function Video image quality as a function of x-ray energy and sample-detector distance. Data are from an ant head (Camponotus pennsylvanicus) using a Cohu 4950 video camera. Within each column, the absorbed x-ray dose on the insect is constant. For all images, the photon flux was kept at approximately 2 × 1010 ph/s/mm2.Back to article page