工业CT旋转扫描台回转精度对成像质量的影响

摘要

The study on the influence of rotation table rotating accuracy on reconstructed industrial CT image quality was meaningful to select a suitable rotation table and reduce the processing cost of rotation table.In the simulation,the location errors of rotation table were divided into two types:normal distribution and skew distribution.And the proj ection data of different accuracy case were reconstructed by filtered back-proj ection algorithm.In addition,the quality of industrial CT image was evaluated by numerical indicators.The simulation results show that the absolute positioning accuracy of rotation table had a strong influence on reconstructed image quality,while the repeated positioning accuracy of rotation table had less effect on the image quality.%研究旋转扫描台回转精度与工业 CT 重建图像质量的关系，对选择合适回转精度的旋转扫描台，降低加工成本具有现实意义。通过计算机仿真分析，模拟了旋转扫描台回转偏差分别服从正态分布、偏态分布的情况，采用滤波反投影算法重建了不同回转精度情况下的工业 CT 图像，并通过数值指标对工业CT重建图像的质量进行了定量评价。仿真结果表明，旋转扫描台的绝对定位精度对工业CT重建图像质量影响较大，而旋转扫描台的重复定位精度对工业 CT 重建图像质量影响较小。