Digital detector for x-ray imaging

H - Electricity – 01 – L

Patent

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Details

H01L 27/146 (2006.01) G01T 1/24 (2006.01)

Patent

CA 2345303

The present invention discloses an X-ray imaging module having a multilayer ionizing radiation sensitive element (60) operative to convert spatially modulated impinging X-ray radiation to a spatially modulated charge distribution. The multilayer ionizing radiation sensitive element has a substrate (100), a conductive layer (102) overlying the substrate, an ionizing radiation sensitive layer (104) overlying the conductive layer which converts ionizing radiation impinging thereon to charge carriers, and a blocking layer (106) exposed to ionizing radiation and optical radiation, overlying the ionizing radiation sensitive layer. The blocking layer limits the passage of charges, of at least one polarity, and blocks optical radiation, of at least one spectral band, from penetrating therethrough, while permitting passage therethrough of ionizing radiation. The X-ray imaging module also contains a charge injection assembly (68) operative to inject charge into the multilayer ionizing radiation sensitive element and readout circuitry coupled to the multilayer ionizing radiation sensitive element.

La présente invention concerne un module d'imagerie radiologique comportant un élément multicouche sensible aux radiations ionisantes (60) dont la fonction est de convertir en distribution de charge à modulation tridimensionnelle un rayonnement radiologique incident à modulation tridimensionnelle. Cet élément multicouche sensible aux rayonnements ionisants comporte un substrat (100), une couche électro-conductrice (102) recouvrant le substrat, une souche sensible aux rayonnements ionisants (104) recouvrant la couche électro-conductrice et convertissant en vecteurs de charge les rayonnements ionisants incidents, et une couche bloquante (106) exposée aux rayonnements ionisants et optiques, recouvrant la couche sensible aux rayonnements ionisants. La couche bloquante limite le passage des charges d'au moins une polarité, et empêche la pénétration des rayonnements optiques dans au moins une bande du spectre, tout en laissant traverser les rayonnements ionisants. Le module d'imagerie radiologique comporte également un ensemble d'injection de charge (68) servant à injecter de la charge dans l'élément multicouche sensible aux rayonnements ionisants et un circuit de mesure couplé à l'élément multicouche sensible aux rayonnements ionisants.

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