摘要
扇束工业CT系统普遍采用滤波反投影 (FBP)重构算法。该算法要求扫描检台旋转中心须与FBP算法重构中心一致。受扫描系统精度的限制 ,这一要求难以得到充分的满足 ,从而引起重构图像出现重影伪像。为此 ,推导了一种校正方法。计算机模拟和实验证明了该方法的有效性。这种方法对ICT扫描系统的调试具有参考价值。
Filter back projection (FBP) reconstruction algorithm is adopted by fan beam industrial CT systems. This algorithm requires the center of rotation of the scan inspection platform to be identical with the reconstruction center of the FBP algorithm. This requirement is hardly satisfied in full under the accuracy restriction of the scanning system. Consequently a kind of artifact called double shadow exhibits itself in reconstruction images. A method of correction is presented to reduce the artifacts. The validity of the method is verified by computer simulation results and experiments. This method is valuable to the debugging of industrial CT scanning systems.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2003年第3期334-337,共4页
Acta Armamentarii
