Patent ID: 8738108

Claim:
An endoscope system comprising: an illuminating section for projecting illumination light to a portion to be observed, the portion including a blood vessel; an image signal obtaining section for obtaining first to third image signals from reflection light reflected from the portion, the reflection light being in a wavelength range from 460 nm to 700 nm, the first image signal being obtained from first reflection light including a wavelength range in which an absorption coefficient varies in accordance with oxygen saturation of hemoglobin in blood, the second image signal being obtained from second reflection light including a wavelength range in which an absorption coefficient varies in accordance with blood volume, the third image signal being obtained from third reflection light including an arbitrary wavelength range; a blood volume and oxygen saturation calculating section for obtaining information on the blood volume and on the oxygen saturation based on the first to third image signals; a first color table for blood volume which stores a relation between blood volume and signal value of a color difference signal; a second color table for oxygen saturation which stores a relation between oxygen saturation and signal value of a color difference signal; a blood volume and oxygen saturation image generator for generating a blood volume image and an oxygen saturation image, the blood volume image representing the information on the blood volume, the oxygen saturation image representing the information on the oxygen saturation, the blood volume image comprising luminance to which the third image signal is assigned and color difference signal to which signal value of the color difference signal corresponding to blood volume which is obtained at the blood volume and oxygen saturation calculating section in the first color table, the oxygen saturation image comprising luminance to which the third image signal is assigned and color difference signal to which signal value of the color difference signal corresponding to oxygen saturation which is obtained at the blood volume and oxygen saturation calculating section in the second color table; and a display section for displaying the blood volume image and the oxygen saturation image simultaneously or selectively.