FIELD: medicine. SUBSTANCE: method involves introducing endoscope into cavity under study containing blood, illuminating the cavity with light and receiving reflected optical signal by means of endoscope. Image of boundary separating media inside of the cavity is built on the basis of reflected signal. Illuminating with light and receiving the reflected signal in the cavity is carried out through natural blood circulation flow. Component arising due to light reflecting from moving blood is separated from the reflected signal by means of optical filtration. The image is built on the basis of the filtered signal Illumination is carried out with light having wavelength selected from wavelength ranges corresponding to minimum value of resulting absorption coefficient and scattering coefficient of light signal in blood. EFFECT: physiologically improved quality of image; wide range of functional applications. 5 cl, 3 dwg
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