US 11,693,146 B2
Calculation method for a dual-energy X-ray imaging system
Chia-Hao Chang, Taoyuan (TW); Yu-Ching Ni, Taoyuan (TW); and Sheng-Pin Tseng, Taoyuan (TW)
Assigned to INSTITUTE OF NUCLEAR ENERGY RESEARCH, ATOMIC ENERGY COUNCIL, EXECUTIVE YUAN, R.O.C, Taoyuan (TW)
Filed by Institute of Nuclear Energy Research, Atomic Energy Council, Executive Yuan, R.O.C, Taoyuan (TW)
Filed on Jan. 12, 2022, as Appl. No. 17/573,756.
Claims priority of application No. 110111112 (TW), filed on Mar. 26, 2021.
Prior Publication US 2022/0308252 A1, Sep. 29, 2022
Int. Cl. G01V 5/00 (2006.01); G01N 23/046 (2018.01)
CPC G01V 5/0041 (2013.01) [G01N 23/046 (2013.01); G01V 5/005 (2013.01)] 9 Claims
OG exemplary drawing
 
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.