Patent ID: 8535221
Filing Date: 2013-09-17
Classification: A61B

Abstract:
1. An electronic endoscope system comprising: an electronic endoscope having an image sensor for capturing an image of an objective tissue including a blood vessel; an illumination section for applying first to third illumination lights to the objective tissue, the first and second illumination lights having different wavelength ranges from each other, each of the first and second illumination lights varying in absorbance in accordance with oxygen saturation of hemoglobin in the blood vessel, the third illumination light being a reference light used for comparison with the first and second illumination lights; a controller for controlling light quantities of the first to third illumination lights based on a first light quantity ratio between the light quantities of the first and third illumination lights and a second light quantity ratio between the light quantities of the second and third illumination lights; a signal obtaining section for obtaining a first imaging signal, a second imaging signal, and a third imaging signal, the first to third imaging signals being outputted from the image sensor in accordance with respective reflection light quantities of reflection lights from the objective tissue upon application of the first to third illumination lights; a vascular information obtaining section for obtaining vascular information based on a first brightness ratio and a second brightness ratio, the first brightness ratio being a ratio between the first and third imaging signals, the second brightness ratio being a ratio between the second and third imaging signals, the vascular information having both oxygen saturation information of the oxygen saturation and vessel depth information of the blood vessel.