论文标题
X射线暗场信号降低由于可见性频谱的硬化而导致
X-ray dark-field signal reduction due to hardening of the visibility spectrum
论文作者
论文摘要
X射线暗场成像可实现超小角X射线散射的空间分辨可视化。使用幻影测量值，我们证明了材料的有效暗场信号可以通过梁中的其他深色场活性物体对可见性谱进行修饰来降低。这是相当于常规光束硬化的暗场，与相关的已知效应不同，在该效果中，暗场信号通过衰减或相移的修饰。我们为这组效应提供了一个理论模型，并通过与测量值进行比较来验证它。这些发现对在多色测量中对暗场信号强度的解释具有重要意义。
X-ray dark-field imaging enables a spatially-resolved visualization of ultra-small-angle X-ray scattering. Using phantom measurements, we demonstrate that a material's effective dark-field signal may be reduced by modification of the visibility spectrum by other dark-field-active objects in the beam. This is the dark-field equivalent of conventional beam-hardening, and is distinct from related, known effects, where the dark-field signal is modified by attenuation or phase shifts. We present a theoretical model for this group of effects and verify it by comparison to the measurements. These findings have significant implications for the interpretation of dark-field signal strength in polychromatic measurements.
