The impact of energy spectrum deviation and correction analysis in dual-energy CT system

The core objective of dual-energy CT is to accurately reconstruct the effective atomic number and electron density of materials, enabling precise material identification. This paper analyzes the impact of X-ray energy spectrum deviation on the precision of dual-energy decomposition, utilizing a dual-energy decomposition algorithm and numerical simulation experiments. Experimental data were collected using security inspection CT equipment. An energy spectrum correction method, based on CT image reprojection technology, was applied to correct the energy spectrum deviation. This approach facilitates accurate dual-energy reconstruction and material identification.