摘要
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.
出处
《光学精密工程》
EI
CAS
CSCD
2002年第6期542-546,共5页
Optics and Precision Engineering
基金
国家自然科学基金资助项目(No.6017201)
关键词
计算机层析成像
射线检测
环状伪像
扫描采样
computed tomography
penetrating radiation tests
ring artifacts
non_uniform response
