Radiological image intensifier tube with dyed porous alumina layer
AssigneeThomson Tubes Electroniques
InventorsYvan Raverdy, Christian Marillat, Daniel Gally
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Abstract
The disclosure relates to radiological image intensifier tubes, and more particularly to means to improve the image resolution of these tubes and/or correct their brightness curve at output. The image intensifier tube comprises an input screen comprising a scintillator borne by an aluminium substrate. A porous layer of alumina is interposed between the scintillator and the substrate. The alumina layer is dyed so as to absorb the light emitted by the scintillator towards the substrate.
Claims15
A radiological input screen for a image intensifier tube, comprising:
- a scintillator layer borne by a substrate,
- a dyed porous layer of alumina interposed between the substrate and the scintillator, the dyed porous alumina layer including a substance that is absorbent at least at a wavelength emitted by the scintillator layer so that light photons emitted by the scintillator layer towards the substrate are at least partially absorbed in the dyed alumina layer.
A method for making an input screen for an image intensifier tube, comprising the steps of:
- providing a scintillation layer borne by an aluminum substrate;
- providing a dyed alumina layer between said aluminum substrate and said scintillator wherein the step of providing said alumina layer includes the step of making a porous alumina layer on the substrate by a method for the electrochemical anodization of said aluminum substrate.
Dependencies are inferred from the claim text.