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Detector response artefacts in spectral reconstruction

机译：光谱重建中的检测器响应伪像

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Energy resolved detectors are gaining traction as a tool to achieve better material contrast. K-edge imaging and tomography is an example of a method with high potential that has evolved on the capabilities of photon counting energy dispersive detectors. Border security is also beginning to see instruments taking advantage of energy resolved detectors. The progress of the field is halted by the limitations of the detectors. The limitations include nonlinear response for both x-ray intensity and x-ray spectrum. In this work we investigate how the physical interactions in the energy dispersive detectors affect the quality of the reconstruction and how corrections restore the quality. We have modeled detector responses for the primary detrimental effects occurring in the detector; escape peaks, charge sharing/loss and pileup. The effect of the change in the measured spectra is evaluated based on the artefacts occurring in the reconstructed images. We also evaluate the effect of a correction algorithm for reducing these artefacts on experimental data acquired with a setup using Multix ME-100 V-2 line detector modules. The artefacts were seen to introduce 20% deviation in the reconstructed attenuation coefficient for the uncorrected detector. We performed tomography experiments on samples with various materials interesting for security applications and found the structural similarity index to increase ＞5% below 60 keV. Our work shows that effective corrections schemes are necessary for the accurate material classification in security application promised by the advent of high flux detectors for spectral tomography.
机译：能量分辨探测器作为一种获得更好材料对比度的工具而越来越受关注。 K边缘成像和层析成像是一种具有高潜力的方法的示例，该方法在光子计数能量色散检测器的功能上得到了发展。边境安全也开始看到仪器利用能量分辨探测器。探测器的局限性阻止了这一领域的发展。局限性包括对X射线强度和X射线光谱的非线性响应。在这项工作中，我们研究了能量分散检测器中的物理相互作用如何影响重建的质量以及校正如何恢复质量。我们已经针对检测器中发生的主要有害影响建模了检测器响应；逃逸峰，电荷共享/损失和堆积。基于在重建图像中出现的伪像，评估测量光谱变化的影响。我们还评估了使用Multix ME-100 V-2线检测器模块通过设置获得的减少实验数据的校正算法的效果，以减少这些伪影。对于未校正的检测器，可以看到伪影在重建的衰减系数中引入了20％的偏差。我们对具有多种对安全应用感兴趣的材料的样品进行了层析成像实验，发现结构相似性指数在60 keV以下增加了5％以上。我们的工作表明，有效的校正方案对于在安全应用中进行准确的材料分类是必要的，这是由用于光谱层析成像的高通量检测器的出现所承诺的。

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