实时定位轨迹工业CT系统研究(英文)

Industrial computed tomography with real-time trajectory tracking

计算机断层成像(CT)在扫描时需要高精度的机械运动以保证重建图像的质量。在工业CT的应用中,如果被检测物体体型较大,高精度的机械运动系统将会难以实现。本文提出了一种基于实时定位系统的工业CT实现方案,以提高大型工业CT系统的适用性。该方案包括视觉定位系统的实现、定位系统位置的选择与性能评估,以及结合定位信息的图像重建方法。基于以上方案,本文以多段直线轨迹扫描为例,模拟了扫描过程中可能出现的移动和定位的误差,并结合模拟扫描数据进行重建。重建结果表明该方法可以减少机械系统不精确所造成的影响,在一定程度上提高了图像的质量。

Computed tomography （CT） requires accurate movement during the scanning process. This condition cannot be easily satisfied in industrial applications if an object to be scanned is very large. To image an object of exceptional size or shape, we propose a new CT system with real-time tracking of the trajectory. In this work, we first introduce the mechanism of tracking system. Then we describe how to select and optimize the position of cameras and mirkers of the above mentioned system. After that, we simulate the tracking process and evaluate the performance. An experiment based on this trajectory tracking scheme validates the effectiveness of this method.