A Dual-energy Stationary CT System Based on Dual-plane Scanning Mode
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摘要: 静态CT技术相较于传统的螺旋CT，在扫描速度上有着革命性的优势，这使得其在行李安检等领域有着巨大的应用前景。目前，要实现静态CT系统的实际应用，需要解决几何尺寸误差标定、有限角重建、双能投影数据匹配等一系列实际问题。本文提出了一种基于分布式X射线源和双平面扫描方式的双能静态CT系统。该系统采用碳纳米管冷阴极射线管，实现X射线源的高速启停；并采用双平面扫描方式，提高投影数据的覆盖角度以减小伪影，并通过采集双能投影数据实现物质识别。本文详细介绍该静态CT系统的系统设计、几何校正及成像方法等内容。实际实验结果显示该系统可对箱包及其内部物体进行三维成像，获得较为理想的形状及材料信息，在行李安检领域具有较高的实际应用价值。Abstract: 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.
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