工业CT中机械径跳对投影数据的影响  

Influence of the Mechanical Runout on ICT Projection Data

作　　者：杨倩[1] 潘晋孝[1] 

机构地区：[1]中北大学现代无损检测研究中心,山西太原030051

出　　处：《机械工程与自动化》2010年第4期115-116,119,共3页Mechanical Engineering & Automation

摘　　要：在工业X射线CT检测系统中,当对某一物体进行检测的时候,系统中的载物台机架会进行不断的旋转。在旋转过程中,机架将会伴随有机械径跳,径跳会影响到探测器接收到的光子数,最后对投影数据产生一定的影响,进而影响重建出的物体图像。针对上面提出的问题,分析了在对物体进行检测过程中,载物台机架发生机械径跳的原因,以及发生径跳时对探测器接收X射线光子的影响,并提出了在考虑CT机架径跳时的CT投影公式,最后对这一投影进行了仿真。When an object is tested by an industry X-ray CT detection system,the rack carrying the object will rotate.The mechanical runout will generate during the rotating process.The photon number will be influenced by the radial runout,and the projection data will be influenced too,so will the reconstructed images.This article mainly analyzed the reasons why the radial runout happened and the influence of mechanical runout on X-ray photons received by the detectors.Based on this,a new CT projection formula about radial runout was proposed and the projection was simulated.

关 键 词：径跳 投影 工业CT 

分 类 号：TP274.5[自动化与计算机技术—检测技术与自动化装置]