首页 | 本学科首页   官方微博 | 高级检索  
     

锥束螺旋CT的串扰屏蔽
引用本文:曾理,邹晓兵,周日峰.锥束螺旋CT的串扰屏蔽[J].计算机工程与应用,2007,43(6):191-193,239.
作者姓名:曾理  邹晓兵  周日峰
作者单位:[1]重庆大学光电技术及系统教育部重点实验室ICT研究中心,重庆400044 [2]重庆大学数理学院,重庆400044
基金项目:国家自然科学基金 , 重庆市科技计划重点攻关项目
摘    要:在锥束CT(Computed Tomography)中,由于X射线特别是高能X射线散射引起的探测器通道间的串扰,会降低探测器的信噪比和物体的空间分辨率,同时也会在图像的边缘产生伪影.采用了一种有利于机械实现的交错螺旋和平行螺旋的扫描方法,通过在探测器面板上加隔离网来减少射线串扰,并采集4次投影数据,以弥补加隔离网后投影数据的缺损.同时对改进的扫描方法和投影采集方法作了计算机仿真,从仿真实验的结果来看,采用探测器4次采样和交错螺旋或平行螺旋的扫描轨迹,能有效减少因射线串扰引起的伪影,并减少了由螺旋运动引起的伪影.

关 键 词:锥束螺旋CT  射线串扰  交错螺旋扫描  平行螺旋扫描  计算机仿真  锥束  螺旋运动  串扰  屏蔽  helical  CT  扫描轨迹  采样  结果  仿真实验  算机仿真  采集方法  投影数据  改进  缺损  隔离  面板  扫描方法  和平  机械  伪影
文章编号:1002-8331(2007)06-0191-03
修稿时间:2006-10

Shield of cross-talk in cone-beam helical CT
ZENG Li,ZOU Xiao-bing,ZHOU Ri-feng.Shield of cross-talk in cone-beam helical CT[J].Computer Engineering and Applications,2007,43(6):191-193,239.
Authors:ZENG Li  ZOU Xiao-bing  ZHOU Ri-feng
Affiliation:1.ICT Research Center,Key Laboratory of Optoelectronic Technology and System of the Education Ministry of China,Chongqing University, Chongqing, Chongqing 400044, China ;2.College of Mathematics and Physics,Chongqing University,Chongqing, Chongqing 400044,China
Abstract:In cone-beam CT(Computed Tomography),because of the cross-talk between detectors units caused by X-ray's scatter(especially high energy X-ray's scatter in industrial CT),the signal-to-noise of detector and the space resolution of reconstructed image are decreased,and the artifacts near the reconstructed image edges are also generated.In this paper,new scan loci and sampled method are used.The heavy metal partitions are fixed on the detector horizontally and vertically between the adjacent detector units.The object is scanned four times,and the projections are sampled four times.This sampled way could decrease the cross-talk of X-ray,and projections are complemented.In this paper,two helical loci are used.A kind of helical loci is named interlaced helix.Another kind of helical loci is parallel helix.After each scan,helical projections are reconstructed using helical FDK algorithm respectively.From the results of simulation experiments,we see the proposed scan loci and sampled method can efficiently reduce the artifacts caused by cross-talk of X-ray's scatter and helical moving,and keep the space resolution of reconstructed images.
Keywords:cone-beam helical CT  cross-talk of X-ray  interlaced helix scan  parallel helix scan  computer simulation
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号