Simulation tools for scattering corrections in spectrally resolved x-ray computed tomography using McXtrace
Simulation tools for scattering corrections in spectrally resolved x-ray computed tomography using McXtrace
复制标题
使用 McXtrace 在光谱分辨 X 射线计算机断层扫描中进行散射校正的仿真工具
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Kristoffer Haldrup
中科院分区：
文献类型：
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作者：
M. Busi;U. L. Olsen;E. Knudsen;J. Frisvad;J. Kehres;E. Dreier;M. Khalil;Kristoffer Haldrup
摘要。光谱计算机断层扫描是一种新兴的成像方法，涉及使用最近开发的能量鉴别光子计数探测器（PCDs）。该技术能够在孤立的高能范围内进行测量，其中x射线与样品之间的主要相互作用是非相干散射。由于散射辐射对能量、材料成分和几何结构的依赖，其校正被证明是一个复杂的问题。蒙特卡罗模拟可以利用物理模型来估计散射对信号的贡献，但代价是计算时间长。提出了一种基于McXtrace的快速蒙特卡罗模拟工具，用于预测复杂形状物体散射和吸收的能量分辨辐射。我们通过使用CdTe单PCD （Multix ME-100）进行测量来验证该工具，并将其用于光谱CT模拟中的散射校正。我们发现，在重建的线性衰减中，校正占相对放大的7%。它是x射线CT获得更准确的材料识别的有用工具，特别是在高能范围内，非相干散射相互作用变得普遍（bb0 - 50 keV）。
Abstract. Spectral computed tomography is an emerging imaging method that involves using recently developed energy discriminating photon-counting detectors (PCDs). This technique enables measurements at isolated high-energy ranges, in which the dominating undergoing interaction between the x-ray and the sample is the incoherent scattering. The scattered radiation causes a loss of contrast in the results, and its correction has proven to be a complex problem, due to its dependence on energy, material composition, and geometry. Monte Carlo simulations can utilize a physical model to estimate the scattering contribution to the signal, at the cost of high computational time. We present a fast Monte Carlo simulation tool, based on McXtrace, to predict the energy resolved radiation being scattered and absorbed by objects of complex shapes. We validate the tool through measurements using a CdTe single PCD (Multix ME-100) and use it for scattering correction in a simulation of a spectral CT. We found the correction to account for up to 7% relative amplification in the reconstructed linear attenuation. It is a useful tool for x-ray CT to obtain a more accurate material discrimination, especially in the high-energy range, where the incoherent scattering interactions become prevailing (>50 keV).
影响因子：
3.8
作者：
Cammin, Jochen;Xu, Jennifer;Taguchi, Katsuyuki
通讯作者：
Taguchi, Katsuyuki