Method and system for characterization and mapping of tissue...

A - Human Necessities – 61 – B

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A61B 5/00 (2006.01) A61B 1/303 (2006.01)

Patent

CA 2400702

The present invention provides a method and an apparatus for the in vivo, non-invasive, early detection of alterations and mapping of the grade of these alterations, caused in the biochemical and/or in the functional characteristics of epithelial tissues during the development of tissue atypias, dysplasias, neoplasias and cancers. The method is based, at least in part, on the simultaneous measurement of the spatial, temporal and spectral alterations in the characteristics of the light that is re-emitted from the tissue under examination, as a result of a combined tissue excitation with light and special chemical agents. The topical or systematic administration of these agents result in an evanescent contrast enhancement between normal and abnormal areas of tissue. The apparatus enables the capturing of temporally successive imaging in one or more spectral bands simultaneously. Based on the measured data, the characteristic curves that express the agent-tissue interaction kinetics, as well as numerical parameters derived from these data, are determined in any spatial point of the examined area. Mapping and characterization of the lesion, are based on these parameters.

L'invention concerne un procédé et un dispositif utiles pour détecter des altérations in vivo de manière précoce et non effractive et cartographier le degré de ces altérations, provoquées dans les caractéristiques biochimiques et/ou fonctionnelles de tissus épithéliaux au cours du développement d'atypies, de dysplasies, de néoplasies et de cancers. Le procédé est fondé au moins partiellement sur la mesure simultanée des altérations spatiales, temporelles et spectrales des caractéristiques de lumière réémise par le tissu examiné, qui résultent de l'excitation du tissu par de la lumière et de l'utilisation combinée d'agents chimiques spéciaux. L'administration topique ou systémique de ces agents permet d'obtenir un renforcement transitoire des contrastes entre les zones de tissu normal et anormal. Le dispositif permet de capturer des images temporelles successives simultanément dans une ou plusieurs bandes spectrales. Sur la base des données mesurées, les courbes caractéristiques qui expriment la cinétique d'interaction agent-tissu ainsi que les paramètres numériques obtenus à partir de ces données sont déterminés en tout point spatial de la zone examinée. La cartographie et la caractérisation de la lésion sont fondées sur ces paramètres.

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