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Experimental ultra fast X-ray computed tomography with a linearly scanned electron beam source

机译:具有线性扫描电子束源的实验性超快速X射线计算机断层扫描

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摘要

We devised and tested a computed tomography approach that utilises a scanned electron beam X-ray source to produce fast tomographic image sequences of transient density distributions. Potential application areas for this technique are the visualisation and measurement of two-phase and particle flows in thermofluid dynamics research, chemical processes, or transport systems for fluids and bulk solids. In our setup we used a linear deflection pattern for the electron beam and a non-annular detector arc to record transmission data of an object from different projection angles. This approach gives the highest achievable axial resolution and is comparatively moderate in effort and costs. For the inverse problem we applied iterative image reconstruction techniques to reconstruct the density distribution from a limited data set. The method has been experimentally tested on static and dynamic phantoms with a frame rate of 1000 images per second and a spatial resolution of approximately 1 mm in plane and axial.
机译:我们设计并测试了一种计算机断层扫描方法,该方法利用扫描的电子束X射线源生成瞬态密度分布的快速断层图像序列。该技术的潜在应用领域是热流体动力学研究,化学过程或流体和散装固体输送系统中两相和颗粒流的可视化和测量。在我们的设置中,我们对电子束使用了线性偏转模式,并使用了非环形检测器弧来记录来自不同投影角度的物体的透射数据。这种方法可提供最高的轴向分辨率,并且工作量和成本相对适中。对于反问题,我们应用了迭代图像重建技术来从有限的数据集中重建密度分布。该方法已在静态和动态幻像上进行了实验测试,帧速率为每秒1000张图像,在平面和轴向上的空间分辨率约为1 mm。

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