Abstract:
The invention relates to a method for the acquisition of in-vivo fluorescence imaging from a fabric using an acquisition system that includes at least one optical fibre exciting the fabric by scanning light beam. According to the invention, the system is used to detect fluorescence signals emitted by the Methylene Blue present in the fabric.
Abstract:
The invention relates to a system for carrying out fibered multiphoton microscopic imagery of a sample (10) for use in endoscopy or fluorescence microscopy. This system comprises: a femtosecond pulsed laser (1, 2) for generating a multiphoton excitation laser radiation; an image guide (8) comprised of a number of optical fibers and permitting the sample to be illuminated by a point-by-point scanning in a subsurface plane; pre-compensating means (4) for pre-compensating for dispersion effects of the excitation pulses in the image guide (8), these means being situated between the pulsed laser and the image guide (8); scanning means for directing, in succession, the excitation laser beam in a fiber of the image guide, and; in particular, an optical head (9) for focussing the excitation laser beam exiting the image guide in the sample (10).
Abstract:
L'invention concerne un système d'imagerie multiphotonique fibre d'un échantillon (10) pour une utilisation en endoscopie ou en microscopie de fluorescence, Ce système comprend : un laser puisé femtoseconde (1, 2) pour générer un rayonnement laser multiphotonique d'excitation, un guide d'image (8) constitué d'une pluralité de fibres optiques et permettant d'illuminer l'échantillon par un balayage point par point dans un plan subsurfacique, de s moyens de pré-compensation (4) pour compenser des effets de dispersion des impulsions d'excitation dans le guide d'image (8), ces moyens étant disposés entre le laser puisé et le guide d'image (8), des moyens de balayage pour diriger tour à tour le faisceau laser d'excitation dans une fibre du guide d'image, et notamment une tête optique (9) pour focaliser le faisceau laser d'excitation sortant du guide d'image dans l'échantillon (10).
Abstract:
An optical head for equipping the distal end of a flexible optical fiber bundle, designed to be urged into contact with an analyzing surface and including optical elements for focusing an excitation signal into a so-called excitation focal point located at a specific depth beneath the analyzing surface and for sampling a signal backscattered by the excitation focal point which is carried back by the fiber bundle. The head includes an optics-holder tube wherein are inserted on one side the distal end portion of the fiber bundle and on the other optical elements, the latter including a plate placed in contact with the end of the fiber bundle whereof the index is close to that of the fiber core and a focusing optical block, an output window being further provided adapted to provide index adaptation so as to eliminate parasitic reflection occurring on the analyzing surface.
Abstract:
Sistema de diagnóstico por imagen multifotónica fibrada de una muestra (10), este sistema consta de: - un láser (2) pulsado para generar un haz láser de excitación multifotónica, - una guía de imagen (8) constituida por una pluralidad de fibras ópticas, que permiten iluminar la muestra(10) por un barrido punto por punto, y - medios de barrido (5) para dirigir por turno el haz láser de excitación en una fibra de la guía de imagen (8),Sistema caracterizado porque consta además de: - medios de compensación (4) para compensar efectos de dispersión de velocidad de grupo y efectos nolineales de los impulsos de excitación en la guía de imagen (8), estos medios están dispuestos entre elláser pulsado (2) y la guía de imagen (8) la dispersión lineal y los efectos no lineales en la guía de imagen(8) modifican el perfil temporal y espectral del impulso de excitación que vuelve a ser sensiblementeidéntico al perfil (18) del impulso saliente del láser, de modo que los medios de compensación que constan de un trozo de fibra óptica seguido por una línea dispersiva, eltrozo de fibra óptica está constituido por una única fibra óptica monomodo, el diámetro del modo de estafibra monomodo es superior al diámetro del modo de los núcleos de la guía de imagen, este trozo de fibraestá dispuesto para hacer aparecer efectos no lineales de ensanchamiento espectral, la línea dispersivaestá dispuesta para introducir un índice de dispersión de velocidad anormal de grupo, retrasando losfotones más rojos del espectro láser de modo que el impulso (19) saliente de la línea dispersiva sea máslargo que el del (18) saliente del láser.
Abstract:
The invention relates to a method for producing a fluorescent fiber image of a sample, wherein a sample is scanned with the aid of an excitation signal; the fluorescent signal emanating from the sample is detected, wherein the excitation signal and fluorescent signal use the same optical path; the optical path is used to excite at least two fluorophores contained in the sample; a final image is produced, including areas that are colored according to the at least two fluorophores. The multimarking according to the invention makes it possible to simultaneously acquire two images in two different wavelength bands. The system according to the invention can comprise a spectrometer for spectral quantification of the fluorescent signal.
Abstract:
L'invention concerne un système d'imagerie multiphotonique fibré d'un échantillon (10) pour une utilisation en endoscopie ou en microscopie de fluorescence. Ce système comprend :- un laser pulsé femtoseconde (1, 2) pour générer un rayonnement laser multiphotonique d'excitation,- un guide d'image (8) constitué d'une pluralité de fibres optiques et permettant d'illuminer l'échantillon par un balayage point par point dans un plan subsurfacique,- des moyens de pré-compensation (4) pour compenser des effets de dispersion des impulsions d'excitation dans le guide d'image (8), ces moyens étant disposés entre le laser pulsé et le guide d'image (8),- des moyens de balayage pour diriger tour à tour le faisceau laser d'excitation dans une fibre du guide d'image, et notamment- une tête optique (9) pour focaliser le faisceau laser d'excitation sortant du guide d'image dans l'échantillon (10).
Abstract:
An optical head for equipping the distal end of a flexible optical fiber bundle, designed to be urged into contact with an analyzing surface and including optical elements for focusing an excitation signal into a so-called excitation focal point located at a specific depth beneath the analyzing surface and for sampling a signal backscattered by the excitation focal point which is carried back by the fiber bundle. The head includes an optics-holder tube wherein are inserted on one side the distal end portion of the fiber bundle and on the other optical elements, the latter including a plate placed in contact with the end of the fiber bundle whereof the index is close to that of the fiber core and a focusing optical block, an output window being further provided adapted to provide index adaptation so as to eliminate parasitic reflection occurring on the analyzing surface.
Abstract:
The invention relates to a method for producing a fluorescent fiber image of a sample, wherein a sample is scanned with the aid of an excitation signal; the fluorescent signal emanating from the sample is detected, wherein the excitation signal and fluorescent signal use the same optical path; the optical path is used to excite at least two fluorophores contained in the sample; a final image is produced, including areas that are colored according to the at least two fluorophores. The multimarking according to the invention makes it possible to simultaneously acquire two images in two different wavelength bands. The system according to the invention can comprise a spectrometer for spectral quantification of the fluorescent signal.
Abstract:
An optical head for equipping the distal end of a flexible optical fiber bundle, designed to be urged into contact with an analyzing surface and including optical elements for focusing an excitation signal into a so-called excitation focal point located at a specific depth beneath the analyzing surface and for sampling a signal backscattered by the excitation focal point which is carried back by the fiber bundle. The head includes an optics-holder tube wherein are inserted on one side the distal end portion of the fiber bundle and on the other optical elements, the latter including a plate placed in contact with the end of the fiber bundle whereof the index is close to that of the fiber core and a focusing optical block, an output window being further provided adapted to provide index adaptation so as to eliminate parasitic reflection occurring on the analyzing surface.