中文摘要：

本文说明了国内外安检技术发展现状；阐述了螺旋CT技术以及如何确定物质的CT数等；研究了螺旋CT扫描方式的关键技术（射线源、探测器及滑环技术等）及其相互间的关系；通过对现有安检设备及性能的比较，得出了采用多层螺旋CT扫描技术对物质进行检测和识别，是今后安检领域发展的必然趋势。

英文摘要：

The paper analyzes the technology conditions of security inspection in home and abroad, and expatiates technology of spiral CT and how to define CT value etc, with studying on the key technology of spiral CT scanning way （X-RAY, detector, technology of pulley etc） and mutual relation. By comparing the present products of security inspection, the conclusion was drawn that it is inevitable to develop the tendency of security inspection area with the checking and discerning the substance by using the technology of multi-layer spiral CT.