Patent ID: 7135686

Claim:
An x-ray detector for fluoroscopy comprising: a. a screen configured to convert x-rays into photons; b. an array of image sensors positioned behind the screen and having at least one output for connection to a computer or other electronic imaging processor, each of said image sensors comprising a plurality of photosensor pixels; and c. a demagnification lens system positioned between the screen and the array of image sensors and configured to transfer photons emitted by the screen to the array of image sensors, said lens system comprising an array of individual lenses; wherein: i. the lens system is quantum limited in operation and able to transfer very low levels of photons from the screen to each photosensor pixel; ii. each image sensor is configured to detect low levels of photons; and iii. wherein the lens system is configured to transfer from the screen to the array of image sensors at least ten photons per photosensor pixel per frame at 30 frames-per-second fluoroscopy.