Active infra-red photography.
D001784:Blood Gas Analysis; D006801:Humans; D007259:Infrared Rays; D008722:Methods; D010100:Oxygen / Q000097:blood*; D010781:Photography / Q000295:instrumentation; D014652:Vascular Diseases / Q000175:diagnosis*; D014656:Vascular Surgical Procedures
D010100:Oxygen