Patent ID: 7834321
Filing Date: 2010-11-16
Classification: G01T,G21K

Abstract:
1. A radiographic imaging apparatus for capturing X-ray images of an object, comprising: a first scintillating phosphor layer having a first thickness responsive to X-rays passing through the object to produce light; a first array of signal sensing elements and readout devices disposed under the first scintillating phosphor layer which receives illumination from the first scintillating phosphor layer, wherein the first signal sensing elements provide signals representing a first X-ray image; a first crossover reducing layer disposed under the first array of signal sensing elements and readout devices; a single substrate disposed under the first crossover reducing layer, the substrate having first and second surfaces and the first crossover reducing layer being formed on the first surface; a second crossover reducing layer disposed under the substrate and being formed on the second surface of the substrate; a second array of signal sensing elements and readout devices disposed under the second crossover reducing layer, opposite to the substrate; a second scintillating phosphor layer disposed under the second array, having a second thickness responsive to X-rays passing through the object and all the layers above the second scintillating phosphor layer to produce light which illuminates the second signal sensing elements to thereby provide signals representing a second X-ray image; means for variably combining the signals of the first and second X-ray images to produce a plurality of composite X-ray images; and the composition and thickness of the first and second scintillating phosphor layers being selected, relative to each other, along with the combined signals to enable selection of a single image of the plurality of composited images with an improved detective quantum efficiency.