Patent ID: 8831305

Claim:
A material identification method with under-sampling in a pseudo dual-energy system is provided comprising: CT scanning an object under inspection, obtaining first projection data with a first tier of detectors in an array to reconstruct a CT image of the object, and obtaining second projection data with a second tier of detectors provided behind a subset of the detectors of the first tier; combining the first and second projection data to obtain dual-energy under-sampled data at a subset of respective projection angles; acquiring a photoelectric coefficient integral value and a Compton coefficient integral value from the dual-energy under-sampled data; segmenting the CT image of the object into a plurality of regions and computing a length by which the dual-energy rays cross each of the regions; computing the photoelectric coefficient and the Compton coefficient by way of dual-energy preprocessing dual-effect decomposition reconstruction method, based on the lengths of the rays crossing the regions, the photoelectric coefficient integral value and the Compton coefficient integral value; computing at least atomic number of material in each of the regions based on the photoelectric coefficient and the Compton coefficient; and identifying the material of the object based on at least the atomic number.