Patent ID: 8238513

Claim:
An imaging system configured to construct a Computed Tomography (CT) image of an internal structure of an object based on a primary radiation, wherein the imaging system is configured to separate the primary radiation from a scattered radiation based on a mathematical model, the imaging system comprising: a computer configured to calculate a scatter-to-primary ratio (SPR) based on the mathematical model to thereby: separate of the primary radiation from the scattered radiation using the SPR in the mathematical model; and construct a CT image based on the primary radiation derived from the mathematical model, wherein the mathematical model is built upon that the primary radiation propagates in a way different from the scattered radiation; and a detector configured to detect radiation intensities in a first position and in a second position, wherein the detector comprises two layers of flat-panel X-ray detector arrays disposed respectively at the first position and the second position and configured to measure a decreasing radiation flux versus distance.