Method and apparatus for imaging tissues

G - Physics – 06 – T

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G06T 7/00 (2006.01)

Patent

CA 2597589

Method and apparatus for imaging tissue (4) by upstream illumination and downstream dual filtering of the exiting light (14) for separation of ballistic photons rays (14a) from stray rays (14b). Dual filtering includes spatial filtering via a pinhole (22) and spatial filtering operated by a fast gate (24). A processor (34) synchronizes flashes (12) of illumination with the fast gate (24) to command opening for passage of the ballistic photons rays (14a) and closure to exclude the stray rays (14b). An image detector (28) downstream of the fast gate (24) collects the ballistic photons rays (14a) for processing by the processor (34) and display on a monitor (36) as a shadowgram (10). Illumination flashes (12) have one or more wavelengths (i) and the image detector (28) is adapted to match the selected wavelengths of the illuminating flashes.

Procédé et dispositif d'imagerie de tissus (4) par illumination amont et double filtrage aval de la lumière sortante (14) pour séparation des rayons photoniques balistiques (14a) des rayons parasites (14b). Le double filtrage fait intervenir un filtrage spatial sténopéique (22) et un filtrage spatial par volet rapide (24). Un processeur synchronise les émissions lumineuses (12) avec le volet rapide (24) de manière à commander l'ouverture pour laisser passer les rayons photoniques balistiques (14a), et la fermeture pour exclure les rayons parasites (14b). Un détecteur d'image (28) en aval du volet rapide (24) collecte les rayons photoniques balistiques (14a) pour traitement par le processeur (34) et affichage sur un écran (36) sous la forme d'un ombrogramme (10). Les émissions lumineuses (12) se font dans une ou plusieurs longueurs d'onde (1) et le détecteur d'image (28) est conçu pour faire correspondre les émissions lumineuses.

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