Patent ID: 9167960
Filing Date: 2015-10-27
Classification: A61B

Abstract:
1. An endoscope system comprising: a lighting section for applying at least first illumination light and second illumination light, in respective frames, to a region of interest, a wavelength range of the first illumination light being different from a wavelength range of the second illumination light, the region of interest including a blood vessel; an image signal acquisition section having a color image sensor with an array of pixels of at least three primary colors, the image signal acquisition section imaging the region of interest in the each frame, the image signal acquisition section imaging the region of interest illuminated with the first illumination light to acquire a blue signal, a green signal and a red signal of a first frame, the image signal acquisition section imaging the region of interest illuminated with the second illumination light to acquire a blue signal, a green signal and a red signal of a second frame; a shift amount calculator for calculating a shift amount between an image of the first frame and an image of the second frame based on the signals of same color; a registration section for aligning images of the blue signal of the first frame and the green and red signals of the second frame, used for calculating an oxygen saturation level of hemoglobin in blood, based on the shift amount; an oxygen saturation image generator for producing an oxygen saturation image of the oxygen saturation level based on only the blue signal of the first frame, and the green and red signals of the second frame that are aligned; and a display section for displaying the oxygen saturation image.