箱包CT检测系统弱信号情况下的CT成像实验研究  

Experimental Study of CT Imaging Under Weak Signal for Luggage CT Inspection System

作　　者：刘金汇[1,2] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084 [2]清华大学核检测技术北京市重点实验室,北京100084

出　　处：《CT理论与应用研究（中英文）》2014年第6期931-938,共8页Computerized Tomography Theory and Applications

摘　　要：在箱包CT检测中,当放射源活度很低的情况时,对CT成像进行了实验研究。利用多次累加的方法降低统计涨落和噪声的影响,使CT图像质量得到提高。实验证明对于弱信号情况下,利用多次累加的方法,CT成像具有比较高的质量,能够实现物性判别的要求。另外对于A/D量化误差也进行了分析。The experimental study of CT imaging was carried out when the activity of radiation source is very low in the case of CT detection for luggage CT inspection system. The method of adding and averaging was used to reduce the effect of statistical fluctuation and noise. And the quality of CT image is improved. Experiments show that for weak signal conditions, using the method of adding and averaging, CT imaging has high quality and can realize property identification requirements. In addition, the A/D quantization error is also analyzed.

关 键 词：弱信号 量化误差 CT成像 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]