Electronic endoscope system, processor for electronic endoscope, and method of displaying vascular information
First Claim
1. An electronic endoscope system comprising:
- an illuminating device for projecting illumination light toward subject tissues inside a body cavity that include blood vessels, said illumination light including first to third narrowband rays, or having a wavelength range including all of the wavelength ranges of the first to third narrowband rays, at least one of the first and second narrowband rays having a central wavelength of not more than 450 nm, each of the first and second narrowband rays including such wavelengths, at which light absorbance in oxygenated hemoglobin differs from light absorbance in reduced hemoglobin that is not combined with oxygen, and the third narrowband rays having a wavelength range different from those of the first and second narrowband rays;
an electronic endoscope having an imaging device for capturing and outputting image signals that represent luminance of said illumination light as being projected toward and then reflected from said subject tissues;
a narrowband signal obtaining device for obtaining first to third narrowband signals from said image signals, the first to third narrowband signals corresponding to the first to third narrowband rays respectively;
a luminance ratio calculator for calculating a first luminance ratio between the first and third narrowband signals and a second luminance ratio between the second and third narrowband signals;
a first storage device previously storing correlations between the first and second luminance ratios and the vessel depth and the oxygen saturation; and
a vascular information acquiring device for acquiring vascular information including both information about vessel depth and information about oxygen saturation representative of the percentage of oxygenated hemoglobin in the blood vessels based on the first and second luminance ratios calculated by said luminance ratio calculator by referring to the correlations stored in said first storage device.
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Accused Products
Abstract
Illumination light projected into a body cavity includes first to third narrowband rays of different wavelength ranges, at least one of these narrowband rays has a central wavelength of not more than 450 nm. Under these narrowband rays, first to third narrowband image signals are respectively obtained through an endoscope. Based on the first to third narrowband image signals, vascular areas containing blood vessels are determined, and a first luminance ratio between the first and third narrowband signals and a second luminance ratio between the second and third narrowband signals are calculated at every pixel of the vascular areas. From the calculated first and second luminance ratios, information about both the depth and oxygen saturation of the blood vessels is acquired with reference to correlation data that correlates the first and second luminance ratios to the vessel depth and the oxygen saturation.
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Citations
11 Claims
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1. An electronic endoscope system comprising:
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an illuminating device for projecting illumination light toward subject tissues inside a body cavity that include blood vessels, said illumination light including first to third narrowband rays, or having a wavelength range including all of the wavelength ranges of the first to third narrowband rays, at least one of the first and second narrowband rays having a central wavelength of not more than 450 nm, each of the first and second narrowband rays including such wavelengths, at which light absorbance in oxygenated hemoglobin differs from light absorbance in reduced hemoglobin that is not combined with oxygen, and the third narrowband rays having a wavelength range different from those of the first and second narrowband rays; an electronic endoscope having an imaging device for capturing and outputting image signals that represent luminance of said illumination light as being projected toward and then reflected from said subject tissues; a narrowband signal obtaining device for obtaining first to third narrowband signals from said image signals, the first to third narrowband signals corresponding to the first to third narrowband rays respectively; a luminance ratio calculator for calculating a first luminance ratio between the first and third narrowband signals and a second luminance ratio between the second and third narrowband signals; a first storage device previously storing correlations between the first and second luminance ratios and the vessel depth and the oxygen saturation; and a vascular information acquiring device for acquiring vascular information including both information about vessel depth and information about oxygen saturation representative of the percentage of oxygenated hemoglobin in the blood vessels based on the first and second luminance ratios calculated by said luminance ratio calculator by referring to the correlations stored in said first storage device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification