基于傅里叶变换重建CT图像的模板参数标定及设计  

Calibration and Design of Template Parameters Based on Fourier Transform Reconstructed CT Images

作　　者：张岩 王硕 李可心 韩超 ZHANG Yan;WANG Shuo;LI Ke-xin;HAN Chao(North China University of Science and Technology College of Chemical Engineering,Tangshan,Hebei,063000,China;North China University of Science and Technology College of Mechanical Engineering,Tangshan,Hebei,063000,China;North China University of Science and Technology College of Economics,Tangshan,Hebei,063000,China)

机构地区：[1]华北理工大学化学工程学院,河北唐山063000 [2]华北理工大学机械工程学院,河北唐山063000 [3]华北理工大学经济学院,河北唐山063000

出　　处：《新一代信息技术》2019年第6期30-37,共8页New Generation of Information Technology

基　　金：华北理工大学2018年大学生创新创业训练计划资助项目(项目编号:X2018040)。

摘　　要：CT系统可用于多种疾病检查,应用十分普遍。但是CT系统在安装时往往存在误差,大大影响了成像的质量,可能会对疾病的诊断造成误差。故本文提出了一种可以改善该问题的方法,即用已知结构的样品标定CT系统,将X射线的发射器和探测器看作等距排列的一系列接收点,X射线的发射器和探测器的相对位置固定不变,对每一个X射线方向,在具有512个等距单元的探测器上测量经位置固定不动的二维待检测介质吸收衰减后的射线能量,进行增益等处理,得到180组接收信息,以此对CT系统进行校正,以提高成像的质量,并根据误差存在原因设计新模板以提高精度和稳定性。The CT system can be widely used in various diseases checking.However there are some mistakes when the system is installed which will influence the formation of image and make errors to the diagnosis of diseases.Therefore this passage gives a method to improve the problem that is to use the known structures samples to calibrate the CT system,then consider X-ray emitters and detectors as a series of receiving points arranged at equal distances,fix the relative position of X-ray emitters and detectors.Otherwise,we measured the radiation energy absorbed and attenuated by a two-dimensional medium fixed in position on a detector with 512 equidistant units,processed the gain,etc and got 180 groups of receiving messages.In order to improve the image quality,a new template is designed to improve the accuracy and stability of CT system.

关 键 词：滤波反投影 傅里叶变换 二维CT图像重建 模板设计 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]