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 concerns a miniature confocal optical head (4) for a confocal imaging system, in particular endoscopic, said head comprising a point source (2a) for producing a light beam (13); a ball lens (12) arranged at the tip of the optical head, partly outside, to cause said light beam to converge in an excitation point (19) located in a subsurface field under observation (14) of a sample (15), the digital aperture of said lens and the dimension of the point source being adapted to ensure confocality of the assembly; and scanning means (10, 211, 22) for rotating the point source so that the excitation point (19) scans said field under observation. The inventive system produces a real-time confocal image (about 10 images/sec.) of very high quality and homogeneous in the entire field (the optical aberrations are constant in the entire field due to the spherical symmetry of the ball lens), and this is achieved through a miniature head.
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:
The present invention relates to an imaging device comprising: an illumination module (1) comprising means for emitting at least one excitation beam; a scanning/injection module (2) comprising an image waveguide (3), the two ends of which, the proximal end (3a) and the distal end (3b) respectively, are connected via a plurality of optical fibres, and scanning/injection means (6) designed to inject the at least one excitation beam in turn into a fibre of the image waveguide (3) and then into the proximal side (3a) of said waveguide and a detection module (4) comprising means for detecting a light flux (14) collected at the distal end (3b) of the waveguide. At least either the illumination module (1) or the detection module (4) is optically conjugate with the scanning/injection module (2) via a conjugating optical fibre (5, 7). The use of conjugating fibres (5, 7) enables the maintenance, repair and updating of the device to be improved. It also enables modal filtering of the excitation beam to be carried out and ensures that the device is confocal.
Abstract:
Procedimiento para realizar una imagen confocal de fluorescencia in vivo in situ, el procedimiento utiliza una guía de imagen hecha de varios millares de fibras ópticas y consiste en barrer punto por punto un tejido en un plano subsuperficial, cada punto correspondiente a una señal de excitación emitida por una fuente continua, desviada e inyectada en una de las fibras ópticas de dicho haz luego enfocada a la salida de dicha fibra en dicho plano, cada punto emitiendo de vuelta una señal de fluorescencia recogida por dicha fibra óptica, luego detectada y digital izada para formar un elemento de imagen, el procedimiento comporta las siguientes etapas: - se desvía la señal de excitación a una velocidad que corresponde a la adquisición de un mínimo de 12 imágenes por segundo en el caso de un modo de visualización máxima de 640 x 640 píxeles, - se detecta la señal de fluorescencia a una frecuencia de detección superior o igual a una frecuencia mínima de preparación de muestreo de las fibras una por una que es sensiblemente igual a 1,5 MHz para dicho mínimo de 12 imágenes por segundo en el caso de un modo de visualización de 640 x 640 píxeles.
Abstract:
The method consists in deflecting the excitation signal at a speed corresponding to acquisition of a number of images per second sufficient for real time use and in detecting the fluorescence signal at a detecting frequency corresponding to a minimum frequency for sampling the fibers one by one. The method uses an image guide consisting of several thousands of optical fibers, an excitation signal being emitted by a source, deflected and injected by turns into the optical fibers of the guide, each excitation point of the tissue in the fiber output emitting in return a fluorescence signal collected by the fiber, then detected and digitized to form an image element. The method also provides for the focussing of the beam in the fiber output to excite a subsurface plane to produce a confocal image. The method also provides for the production of a divergent beam in the fiber output capable of exciting a micro-volume of the tissue from the surface.
Abstract:
The head has a laser source to produce a light beam (13), and a ball lens (12), with a large numerical aperture, disposed at the end of the head to converge the beam at an excitation point (19). The point is located in an observed sub-surface field (14) of a sample (15). A scanning unit (10) displaces the source in rotation such that the point scans the field. An independent claim is also included for a confocal imaging system.
Abstract:
La présente invention concerne un dispositif d'imagerie, comprenant: un module d'illumination (1) comprenant des moyens pour émettre au moins un faisceau d'excitation; un module de balayage et d'injection (2) comprenant un guide d'image (3) dont deux extrémités respectivement proximale (3a) et distale (3b) sont reliées par une pluralité de fibres optiques, et des moyens (6) de balayage et d'injection agencés pour injecter l'au moins un faisceau d'excitation tour à tour dans une fibre du guide d'image (3) et du côté proximal (3a) du guide; un module de détection (4) comprenant des moyens pour détecter un flux lumineux (14) collecté à l'extrémité distale (3b) du guide. Au moins un parmi le module d'illumination (1) et le module de détection (4) est conjugué optiquement au module de balayage et d'injection (2) par une fibre optique de conjugaison (5, 7). L'utilisation de fibres de conjugaison (5, 7) permet d'améliorer la maintenance, la réparation et la mise à jour du dispositif, et peut en outre permettre de réaliser un filtrage modal du faisceau d'excitation et d'assurer la confocalité du dispositif.
Abstract:
The head has a laser source to produce a light beam (13), and a ball lens (12), with a large numerical aperture, disposed at the end of the head to converge the beam at an excitation point (19). The point is located in an observed sub-surface field (14) of a sample (15). A scanning unit (10) displaces the source in rotation such that the point scans the field. An independent claim is also included for a confocal imaging system.