Patent ID: 8313426

Claim:
An endoscope system at least a part of which can be inserted into a body cavity of an organism for capturing an image of an observation target in the body cavity, comprising: a light source section for selectively irradiating two or more types of excitation lights having different spectral characteristics so as to excite two or more types of fluorescent agents having different optical characteristics; an imaging section provided on the part to be inserted into the body cavity, having a filter which cuts the respective excitation lights, and having a light-receiving sensitivity in the wavelength bands of the two or more types of fluorescences radiated from the observation target by the respective excitation lights; a storage section for storing relation information between the fluorescence intensity generated by excitation with each of the excitation lights and the concentration of each of the fluorescent agents; a concentration information computing section for computing concentration information of each of the fluorescent agents on the basis of the fluorescence intensities of two or more images captured by the imaging section and the relation information stored in the storage section, and outputting the concentration information; and a mode switching section capable of switching between a first fluorescence observation mode in which at least one of the fluorescence intensity images acquired by the imaging section is presented, and a second fluorescence observation mode in which the concentration information of each of the fluorescent agents computed by the concentration information computing section is presented.