箱包CT检测系统弱信号情况下的CT成像实验研究
|
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.
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.
引文
[1]王琪,陈志强,邬小平,等.X射线安全检查技术综述[J].CT理论与应用研究,2004,13(1):32-37.Wang Q,Chen ZQ,Wu XP,et al.Review of X-ray security inspection technology[J].CT Theory and Applications,2004,13(1):32-37.
[2]吴万龙,李元景,桑斌,等.CT技术在安检领域的应用[J].CT理论与应用研究,2005,14(1):24-32.Wu WL,Li YJ,Sang B,et al.Application of computed tomography in explosives detection[J].CT Theory and Applications,2005,14(1):24-32.
[3]王珏,王福全,姜增辉.基于多层螺旋CT扫描的安检系统研究[J].核电子学与探测技术,2008,28(4):717-721.Wang J,Wang FQ,Jiang ZH.Scanning technology with multi-slice helical CT in security inspection domain[J].Nuclear Electronics&Detection Technology,2008,28(4):717-721.
[4]赵悦,陈曦,牛轶杰.民航CT安检设备技术性能检测与评估研究[J].CT理论与应用研究,2012,21(3):449-456.Zhao Y,Chen X,Niu YJ.The research on test and evaluation of CT security inspection equipment for civil aviation[J].CT Theory and Applications,2012,21(3):449-456.
[5]高上凯.医学成像系统[M].北京:清华大学出版社,2000:15-18.Gao SK.Medical imaging system[M].Beijing:Tsinghua University Press,2000:15-18.
[6]庄天戈.CT原理与算法[M].上海:上海交通大学出版社,1992:63-76.Zhuang TG.Principle and algorithm of CT[M].Shanghai:Shanghai Jiaotong University Press,1992:63-76.
[7]安继刚,卿上玉,邬海峰.充气电离室[M].北京:原子能出版社,1997:22-25.An JG,Qing SY,Wu HF.Gas-filled ionization chamber[M].Beijing:Atomic Energy Press,1997:22-25.
[8]Jiang M,Wang G.Convergence studies on iterative algorithms for image reconstruction[J].IEEE Transactions on Medical Imaging,2003,22(5):569-579.
[9]张兆田,张朋.改进的图像迭代重建算法[J].电子与信息学报,2004,23(10):1626-1630.Zhang ZT,Zhang P.An algorithm for improved iterative image reconstruction[J].Journal of Electronics&Information Technology,2004,23(10):1626-1630.
[2]吴万龙,李元景,桑斌,等.CT技术在安检领域的应用[J].CT理论与应用研究,2005,14(1):24-32.Wu WL,Li YJ,Sang B,et al.Application of computed tomography in explosives detection[J].CT Theory and Applications,2005,14(1):24-32.
[3]王珏,王福全,姜增辉.基于多层螺旋CT扫描的安检系统研究[J].核电子学与探测技术,2008,28(4):717-721.Wang J,Wang FQ,Jiang ZH.Scanning technology with multi-slice helical CT in security inspection domain[J].Nuclear Electronics&Detection Technology,2008,28(4):717-721.
[4]赵悦,陈曦,牛轶杰.民航CT安检设备技术性能检测与评估研究[J].CT理论与应用研究,2012,21(3):449-456.Zhao Y,Chen X,Niu YJ.The research on test and evaluation of CT security inspection equipment for civil aviation[J].CT Theory and Applications,2012,21(3):449-456.
[5]高上凯.医学成像系统[M].北京:清华大学出版社,2000:15-18.Gao SK.Medical imaging system[M].Beijing:Tsinghua University Press,2000:15-18.
[6]庄天戈.CT原理与算法[M].上海:上海交通大学出版社,1992:63-76.Zhuang TG.Principle and algorithm of CT[M].Shanghai:Shanghai Jiaotong University Press,1992:63-76.
[7]安继刚,卿上玉,邬海峰.充气电离室[M].北京:原子能出版社,1997:22-25.An JG,Qing SY,Wu HF.Gas-filled ionization chamber[M].Beijing:Atomic Energy Press,1997:22-25.
[8]Jiang M,Wang G.Convergence studies on iterative algorithms for image reconstruction[J].IEEE Transactions on Medical Imaging,2003,22(5):569-579.
[9]张兆田,张朋.改进的图像迭代重建算法[J].电子与信息学报,2004,23(10):1626-1630.Zhang ZT,Zhang P.An algorithm for improved iterative image reconstruction[J].Journal of Electronics&Information Technology,2004,23(10):1626-1630.