Patent ID: 8131349

Claim:
A lesion extracting device comprising: a light source for emitting an excitation light toward a subject body to be examined; a control unit for changing an amount of the excitation light; a light irradiating and receiving portion for irradiating the excitation light to the subject body and receiving fluorescence generated from the subject body; a distance holding member for holding a distance between the subject body and the light irradiating and receiving portion at a predetermined value; a measuring unit for measuring a change in the intensity of the fluorescence with respect to a change in the amount of the excitation light, the intensity of fluorescence being received by the light irradiating and receiving portion; and an extracting unit for calculating a ratio of the change in the intensity of fluorescence on the basis of a ratio of the change in the amount of the excitation light to the change in the intensity of fluorescence and for extracting a lesion part of the subject body on the basis of the ratio of the changes in the amount of the excitation light to the ratio of the changes in the intensity of fluorescence.