A Dual-energy Stationary CT System Based on Dual-plane Scanning Mode

Stationary CT technique is a promising approach for baggage inspection due to its high scanning speed compared with traditional spiral-CT. The main challenges which current stationary CT system meets are the geometric calibration, image reconstruction from limited angle data and matching of dual-energy projection. In this paper, we presented a dual-energy stationary CT system based on dual-plane scanning mode. The multi-bean X-ray source of the system is made of carbon nanotube cathode, which enables fast switching of exposure sequence. The dual-plane scanning mode is applied in order to increase the cover angle of projection data and reduce artifacts. The attenuation information is collected by the dual-energy detector which enables materials decomposition and recognition. According to the experimental results of luggage, the stationary CT system presented in this paper enables three-dimensional imaging of luggage with high resolution and detailed material information, which indicates its potential in applications of baggage inspection.