Detecting and mapping of inflamed zones in a living tissue
First Claim
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1. Process for the detection and mapping of inflamed zones of living tissues, which comprises:
- subjecting the tissues to be analyzed to a luminous excitation with a spectral field;
acquiring an unprocessed fluorescent signal of endogenous porphyrins at a plurality of measurement points;
acquiring, for the same tissues to be analyzed, fluorescence signals in the spectral bands centered respectively on about 600 nm and on at least one of about 630 nm and 680-690 nm, and on at least one of about 470 nm and 510-520 nm, for each of the measurement points;
forming for each spectral band a fluorescence image from values of fluorescence densities taken in the spectral band in question for the different measurement points, using a normalization factor of a given value for images collected at at least one of 470 nm and 510 nm and another normalization factor of a different value for images collected at at least one of 600 nm, 630 nm, and 690 nm, the values of these two factors being defined so as to obtain an optimum gradation of the colors or levels of gray on the final image after processing; and
determining, for each measurement point, the fluorescence intensity for wavelengths characteristic of the endogenous porphyrins.
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Abstract
A method for detecting and mapping inflamed zones in living tissues and a device for implementing the method. The method includes subjecting the tissues to be analyzed to a luminous excitation with a predetermined spectral domain, acquiring at least the raw fluorescence signal of the porphyrins for a plurality of measurement points, and in determining, for each measurement point, the intensity of the fluorescence for the wavelengths characteristic of endogenous porphyrins.
47 Citations
18 Claims
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1. Process for the detection and mapping of inflamed zones of living tissues, which comprises:
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subjecting the tissues to be analyzed to a luminous excitation with a spectral field;
acquiring an unprocessed fluorescent signal of endogenous porphyrins at a plurality of measurement points;
acquiring, for the same tissues to be analyzed, fluorescence signals in the spectral bands centered respectively on about 600 nm and on at least one of about 630 nm and 680-690 nm, and on at least one of about 470 nm and 510-520 nm, for each of the measurement points;
forming for each spectral band a fluorescence image from values of fluorescence densities taken in the spectral band in question for the different measurement points, using a normalization factor of a given value for images collected at at least one of 470 nm and 510 nm and another normalization factor of a different value for images collected at at least one of 600 nm, 630 nm, and 690 nm, the values of these two factors being defined so as to obtain an optimum gradation of the colors or levels of gray on the final image after processing; and
determining, for each measurement point, the fluorescence intensity for wavelengths characteristic of the endogenous porphyrins. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Device for the detection and mapping of inflamed zones of living tissues, which comprises:
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a luminous excitation unit having an intensity equal to at most 0.5 W/cm2, in the spectral bands centered on about 400 nm and on about 590 nm;
a filtering module comprising a set of pass-band filters adapted for the selection of phosphorescences specific to endogenous porphyrins;
means for acquiring unprocessed fluorescent signal of the endogenous porphyrins at a plurality of measurement points;
a unit for detecting and recording images of the fluorescence of the surface of the tissues to be analyzed;
means for acquiring, for the same tissues to be analyzed, fluorescence signals in the spectral bands centered respectively on about 600 nm and on at least one of about 630 nm and 680-690 nm, and on at least one of about 470 nm and 510-520 nm, for each of the measuring points;
means for forming for each spectral band a fluorescence image from values of fluorescence densities taken in the spectral band in question for the different measurement points;
a data processing unit for the point by point or pixel by pixel processing of images collected and the control and management of the assembly of the device, associated with means for storing and editing the images, to detect and map the inflamed zones of the tissues;
said data processing unit using a normalization factor of a given value for images collected at at least one of 470 nm and 510 nm and another normalization factor of a different value for images collected at 600 nm and at at least one of 630 nm and 690 nm, the values of these two factors being defined so as to obtain an optimum gradation of the colors or levels of gray on the final image after processing; and
means for determining, for each measurement point, the fluorescence intensity for wavelengths characteristic of the endogenous porphyrins. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification