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北京航空航天大学, 机械工程及自动化学院 北京,100083
收稿日期:2002-04-15,
修回日期:2002-10-31,
网络出版日期:2002-12-15,
纸质出版日期:2002-12-15
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傅健, 路宏年. 扇束X射线ICT中环状伪影的一种校正方法[J]. 光学精密工程, 2002,(6): 542-546
FU Jian, LU Hong-nian. Correcting method for ring artifacts in fan-beam X-ray ICT[J]. Editorial Office of Optics and Precision Engineering, 2002,(6): 542-546
在扇束X射线ICT系统中
由于探测器响应不一致性
在重构图像上会引起环状伪影.为解决这个问题
提出了一类可以抑制探测器响应不一致性
从而能消除环状伪影的扫描采样方式;归纳、分析了这类扫描方式所必须满足的一个条件.计算机模拟和实验证明
在满足这个条件的扫描采样方式下
具有响应不一致性的探测器获取的投影数据无须任何额外的处理
即可使用相应的滤波反投影重构算法
重构出环状伪影显著减弱的图像.
In a fan-beam X-ray ICT system
the non-uniform response of the detecting system could cause ring artifacts in image reconstruction. In order to mitigate this situation
a class of scan sampling patterns was proposed
which could suppress the non-uniform response and consequently decrease the ring artifacts. A condition
which this class of scan patterns must meet
is discussed. Computer simulation and experimental results show that the reconstruction of image with few ring artifacts
and without any other special disposal
could be generated with a filtered back-projection algorithm using those data sampled by the detecting system with non-uniform response under this kind of scan pattern.
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金春水,王占山,曹建林.软X射线投影光刻原理装置的设计[J].光学精密工程,2000,8(1):66-70.
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张丕状,路宏年. 面阵CCD微光像感器图像的校正[J]. 兵工学报,2000,21(4): 361-364.
王召巴.成像系统响应的不一致性对重建图像质量的影响[J].光学技术, 2001, 27(2):100-102.
庞彦伟,王召巴. CT图像环形伪迹分析[J]. 华北工学院学报,2001,22(1):16-19.
傅健,路宏年. 旋转中心随旋转角度变化的一类扇束重构算法[J].航空制造技术,已录用.
尼启良,陈波,巩岩,等.激光等离子体软X射线光源的一种诊断方法[J].光学精密工程,2002,10(3):235-238.
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