ABSTRACT Conventional direct radiography may fail to successfully produce images of corrosion in large pipes containing liquid and in tanks because the attenuation can be very high. It also fails when either side of the object is not accessible. These limitations do not exist in backscatter imaging because it is a one-sided imaging technique. However, backscatter imaging can be slow. In this study, the feasibility of a new backscatter imaging system based on a moving collimator that can produce images quickly is studied. Backscattered radiation from a broad-beam industrial X-ray machine is collimated by a special collimator to allow only parallel scattered radiation to pass and reach the image plate. Because part of the backscattered radiation can be stopped by the collimator septa, the collimator is put into motion; this allows a complete image to be revealed. An electro-mechanical system is designed to move the collimator either in steps or continuously. The distance, speed and direction of the movement are controlled by a smart motor using LabVIEW. Images of Polyvinylchloride (PVC) and aluminum objects are shown. Moving collimators can be added to existing radiographic systems to make them useful for both direct and backscatter imaging.

中文翻译：

---

用于工业反向散射成像的新型移动准直器的可行性

摘要 传统的直接射线照相可能无法成功地生成盛装液体的大型管道和储罐中的腐蚀图像，因为衰减可能非常高。当对象的任何一侧都不可访问时，它也会失败。这些限制在反向散射成像中不存在，因为它是一种单面成像技术。然而，反向散射成像可能很慢。在这项研究中，研究了一种基于移动准直器的新型反向散射成像系统的可行性，该系统可以快速生成图像。来自宽光束工业 X 射线机的背向散射辐射由特殊准直器准直，仅允许平行散射辐射通过并到达图像板。由于部分反向散射辐射可以被准直器隔片阻挡，准直器开始运动；这允许显示完整的图像。机电系统旨在逐步或连续移动准直器。运动的距离、速度和方向由使用 LabVIEW 的智能电机控制。显示了聚氯乙烯 (PVC) 和铝物体的图像。移动准直器可以添加到现有的射线照相系统中，使其可用于直接和反向散射成像。