Imaging system including scintillation conversion screen
View Patent ↗A portable, self-contained, electronic radioscopic imaging system uses an X-ray converter screen for converting impinging X-ray radiation to visible light, and thus each point impinged on the screen by X-ray radiation scintillates visible light emissions diverging from the screen. An emission modification lens layer, e.g., a prismatic brightness enhancement film or a sprayed on transmissive layer, through which the visible light emitted from the screen is transmitted is superposed with the screen for generally focusing the diverging visible light as a restricted cone of illumination propagating outwardly from each point impinged on the screen to increase the fraction of light directed into the collection cone and reducing the amount of scattered visible light from the screen.
1. An imaging system comprising:
a non-visible radiation source;
an object to be imaged;
a transmissive screen for converting non-visible radiation from the non-visible radiation source into visible radiation after the non-visible radiation passes through the object to be imaged;
a transmissive optical coating containing microspheres on the transmissive screen for concentrating the visible radiation from the transmissive screen; and
an optical focusing system for focusing the concentrated visible radiation from the transmissive optical coating onto an imaging device.
2. The imaging system of claim 1 , wherein the non-visible radiation is x-ray radiation.
3. The imaging system of claim 1 , wherein the imaging system further includes a binder layer, binding the transmissive screen to the transmissive optical coating.
4. The imaging system of claim 3 , wherein the binder layer has a first optical index and a predetermined thickness and each microsphere of the transmissive optical coating has a second optical index and a predetermined focal point.
5. The imaging system according to claim 4 , wherein the second optical index is higher than the first optical index.
6. The imaging system according to claim 4 wherein the predetermined thickness of the binder layer is approximately equal to the predetermined focal point of each of the microspheres.