Substance identification method

According to the substance identification method provided by the invention, two or more substances are used for calibration based on dual-effect substance decomposition, the substance decomposition accuracy is improved, and a more accurate atomic number estimation physical model is obtained through a self-adaptive parameter determination method. The method is divided into two parts of empirical dual-effect substance decomposition and adaptive effective atomic number estimation, in the empirical dual-effect substance decomposition, through calibration of various standard motifs, polynomial combination is performed on projection data, and constraint is performed in an image domain to realize determination of decomposition parameters and estimation of electron density; according to effective atomic number estimation, a self-adaptive effective atomic number estimation model is established through calibration of a known standard motif, and effective atomic number estimation of an imaging substance is achieved. Acc