CPC G01V 5/0041 (2013.01) [G01N 23/046 (2013.01); G01V 5/005 (2013.01)] | 9 Claims |
1. A calculation method for a dual-energy X-ray imaging system, comprising:
establishing an attenuation coefficient ratio of a dual-energy projection image of each of a plurality of reference materials according to known material characteristics of the reference materials respectively;
establishing a calibration data set according to an effective atomic number of each of the reference materials and the attenuation coefficient ratio corresponding thereto;
obtaining a characteristic model of a correlation between the material attenuation coefficient ratios and the effective atomic numbers of the reference materials by a rational polynomial approximation method;
establishing a material attenuation coefficient ratio of a dual-energy projection image of an unknown material; and
substituting the material attenuation coefficient ratio of the unknown material into the characteristic model to obtain an effective atomic number corresponding to the unknown material.
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