Representative example of a thermal image showing the change in lower limb temperature after induction of anesthesia. These images were obtained for a 54-yr-old non–diabetes mellitus patient during isoflurane anesthesia. Theright color barindicates the temperature. Images were taken just before induction of anesthesia and every 3 min thereafter for 15 min, to give a total of six images. Arrowsshow the line of the great saphenous vein.