A tomography system at the thermal neutron column of the ENEA Casaccia TRIGA reactor
A tomography system at the thermal neutron column of the ENEA Casaccia TRIGA reactor
复制标题
ENEA Casaccia TRIGA 反应堆热中子柱的断层扫描系统
DOI：
10.1007/s003390201565
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
L. Storelli
中科院分区：
文献类型：
--
作者：
R. Rosa;A. Festinesi;R. Massari;G. Sangiovanni;E. Santoro;L. Storelli
研制的系统将用于通量约为106N/cm2的准直热中子束。该系统采用192×165像素的制冷面阵和NE426闪烁体增强器，采用传统的光耦合方式。精细的机械调节系统可实现断层摄影仪的精确定位，还可确保CCD阵列与旋转轴和平移轴对齐。200个投影的采集在大约30 分钟内完成，重建时间(最大40 )取决于重建矩阵顺序。对重要物体的射线照相和层析照相进行了说明。重建算法包括空间和时间不均匀校正和滤波，对于512×512个像素的投影得到了良好的结果。
The developed system is intended for use at a collimated thermal neutron beam with a flux of about 106n/cm2s. The system works with a cooled CCD array (192×165 pixels) and an intensifier for light from a NE426 scintillator with traditional optical coupling. A fine mechanical regulation system allows an accurate positioning of the tomographer, also ensuring the alignment of the CCD array with the rotation and translation axes. The acquisition of 200 projections is carried out in about 30 min with a reconstruction time (40 min max) depending on the reconstruction-matrix order. Radiography and tomography of significant objects are illustrated. The reconstruction algorithm, including spatial and temporal inhomogeneity corrections and filters, was tested with good results for projections up to 512×512 pixels.