摘要
X射线透视技术已被证实是一种非常有效的安全检查方法.基于这种技术的伪双能X射线透射系统广泛应用于车站、机场等重要场所.伪双能系统的射线源产生的是连续能谱的X射线,因此基于传统双能透射模型的物质鉴别方法由于受到物体的厚度影响而导致准确性的降低.在根据高低能信号的对数比值的基础上,引入X射线的衰减因素到物质属性特征空间中,研究出矫正厚度影响的鉴别方法.实验结果证明在高维特征空间中的物质鉴别方法能够有效提高鉴别结果的准确性.
The effectiveness of X-ray transmission screening techniques have been proved in security inspection since past decades, and many pseudo dual-energy commercial systems have been applied in public traffic stations, The X-ray tubes adopted in pseudo dual-energy systems produce X-ray photons with continuous energy spectra, which results in the decrement of the correctness of object classification based on traditional dual-energy transmission models because of the thickness effect. Besides the ratio of the logarithms of measurements individually from higher and lower energy detectors, the attenuations of photons were added to feature space for object dassification. The results indicated the improvement of correctness of the classification in high dimension feature space.
出处
《电子器件》
CAS
2007年第1期219-221,共3页
Chinese Journal of Electron Devices
关键词
X射线透视
厚度影响
物质识别
伪双能
pseudo dual-energy
x-ray transmission
thickness effect
object classification
